diff --git a/res/layouts/inventory.xml b/res/layouts/inventory.xml
index 4291ab4d3..7a33b054f 100644
--- a/res/layouts/inventory.xml
+++ b/res/layouts/inventory.xml
@@ -1,4 +1,4 @@
 <inventory>
-    <slots-grid pos="0, 164" rows="1" count="10" sharefunc="inventory_share_func"/>
-    <slots-grid rows="3" start-index="10" count="30" sharefunc="inventory_share_func"/>
+    <slots-grid pos="0, 164" rows="1" count="10" sharefunc="share_func"/>
+    <slots-grid rows="3" start-index="10" count="30" sharefunc="share_func"/>
 </inventory>
diff --git a/res/layouts/inventory.xml.lua b/res/layouts/inventory.xml.lua
index 9f836223d..5c79db6ff 100644
--- a/res/layouts/inventory.xml.lua
+++ b/res/layouts/inventory.xml.lua
@@ -1,12 +1 @@
-function inventory_share_func(invid, slotid)
-    local blockinv = hud.get_block_inventory()
-    if blockinv ~= 0 then
-        inventory.move(invid, slotid, blockinv)
-    elseif rules.get("allow-content-access") then
-        inventory.set(invid, slotid, 0, 0)
-    elseif slotid < 10 then
-        inventory.move_range(invid, slotid, invid, 10)
-    else
-        inventory.move_range(invid, slotid, invid, 0, 9)
-    end
-end
+share_func = require("core:inventory_utils").share_default_func
diff --git a/res/modules/inventory_utils.lua b/res/modules/inventory_utils.lua
new file mode 100644
index 000000000..17089cdab
--- /dev/null
+++ b/res/modules/inventory_utils.lua
@@ -0,0 +1,21 @@
+local M = {}
+
+function M.share_default_func(invid, slotid)
+    local blockinv = hud.get_block_inventory()
+    local playerinv = player.get_inventory(hud.get_player())
+    if blockinv ~= 0 then
+        if invid == blockinv then
+            inventory.move(blockinv, slotid, playerinv)
+        else
+            inventory.move(invid, slotid, blockinv)
+        end
+    elseif rules.get("allow-content-access") then
+        inventory.set(invid, slotid, 0, 0)
+    elseif slotid < 10 then
+        inventory.move_range(invid, slotid, invid, 10)
+    else
+        inventory.move_range(invid, slotid, invid, 0, 9)
+    end
+end
+
+return M
diff --git a/src/frontend/hud.cpp b/src/frontend/hud.cpp
index 08a4b8455..6751b885c 100644
--- a/src/frontend/hud.cpp
+++ b/src/frontend/hud.cpp
@@ -106,6 +106,7 @@ std::shared_ptr<UINode> HudElement::getNode() const {
 std::shared_ptr<InventoryView> Hud::createContentAccess() {
     auto& content = frontend.getLevel().content;
     auto& indices = *content.getIndices();
+    auto& input = this->input;
     auto inventory = player.getInventory();
     
     size_t itemsCount = indices.items.count();
@@ -115,12 +116,19 @@ std::shared_ptr<InventoryView> Hud::createContentAccess() {
     }
 
     SlotLayout slotLayout(-1, glm::vec2(), false, true, nullptr,
-    [inventory, &indices](uint, ItemStack& item) {
+    [inventory, &indices, &input](uint, ItemStack& item) {
         auto copy = ItemStack(item);
+        if (input.pressed(Keycode::LEFT_CONTROL)) {
+            copy.maximizeCount(indices);
+        }
         inventory->move(copy, indices);
     }, 
-    [this, inventory](uint, ItemStack& item) {
-        inventory->getSlot(player.getChosenSlot()).set(item);
+    [this, inventory, &indices, &input](uint, ItemStack& item) {
+        auto copy = ItemStack(item);
+        if (input.pressed(Keycode::LEFT_CONTROL)) {
+            copy.maximizeCount(indices);
+        }
+        inventory->getSlot(player.getChosenSlot()).set(copy);
     });
 
     InventoryBuilder builder(gui);
diff --git a/src/graphics/ui/elements/InventoryView.cpp b/src/graphics/ui/elements/InventoryView.cpp
index 395c8d34e..614d4c913 100644
--- a/src/graphics/ui/elements/InventoryView.cpp
+++ b/src/graphics/ui/elements/InventoryView.cpp
@@ -366,28 +366,12 @@ void SlotView::performLeftClick(ItemStack& stack, ItemStack& grabbed) {
         );
         return;
     }
-
+    auto indices = *content->getIndices();
     if (!layout.itemSource && stack.accepts(grabbed) && layout.placing) {
         action = InteractionAction::PUT;
-        stack.move(grabbed, *content->getIndices());
+        stack.move(grabbed, indices);
     } else {
-        if (layout.itemSource) {
-            if (grabbed.isEmpty()) {
-                action = InteractionAction::TAKE;
-                grabbed.set(stack);
-            } else {
-                action = InteractionAction::PUT;
-                grabbed.clear();
-            }
-        } else if (grabbed.isEmpty()) {
-            if (layout.taking) {
-                action = InteractionAction::TAKE;
-                std::swap(grabbed, stack);
-            }
-        } else if (layout.taking && layout.placing) {
-            action = InteractionAction::PUT;
-            std::swap(grabbed, stack);
-        }
+        actIfCannotPut(stack, grabbed, action);
     }
     
     if (action != InteractionAction::UNDEFINED) {
@@ -400,6 +384,39 @@ void SlotView::performLeftClick(ItemStack& stack, ItemStack& grabbed) {
     }
 }
 
+void SlotView::actIfCannotPut(ItemStack& stack, ItemStack& grabbed, InteractionAction& action) {
+    const auto& input = gui.getInput();
+    auto indices = *content->getIndices();
+    if (layout.itemSource) {
+        if (grabbed.isEmpty()) {
+            action = InteractionAction::TAKE;
+            grabbed.set(stack);
+            if (input.pressed(Keycode::LEFT_CONTROL)) {
+                grabbed.maximizeCount(*content->getIndices());
+            }
+        } else {
+            if (grabbed.accepts(stack)) {
+                auto& def = indices.items.require(stack.getItemId());
+                if (grabbed.getCount() < def.stackSize) {
+                    action = InteractionAction::TAKE;
+                    grabbed.setCount(grabbed.getCount() + 1);
+                }
+            } else {
+                action = InteractionAction::PUT;
+                grabbed.clear();
+            }
+        }
+    } else if (grabbed.isEmpty()) {
+        if (layout.taking) {
+            action = InteractionAction::TAKE;
+            std::swap(grabbed, stack);
+        }
+    } else if (layout.taking && layout.placing) {
+        action = InteractionAction::PUT;
+        std::swap(grabbed, stack);
+    }
+}
+
 void SlotView::performRightClick(ItemStack& stack, ItemStack& grabbed) {
     if (layout.rightClick) {
         layout.rightClick(inventoryId, stack);
diff --git a/src/graphics/ui/elements/InventoryView.hpp b/src/graphics/ui/elements/InventoryView.hpp
index 243d8b6b5..fbfe3eee9 100644
--- a/src/graphics/ui/elements/InventoryView.hpp
+++ b/src/graphics/ui/elements/InventoryView.hpp
@@ -123,6 +123,8 @@ namespace gui {
             SHARE = 2,
             UNDEFINED,
         };
+    private:
+        void actIfCannotPut(ItemStack& stack, ItemStack& grabbed, InteractionAction& action);
     };
 
     class InventoryView final : public gui::Container {
diff --git a/src/items/ItemStack.cpp b/src/items/ItemStack.cpp
index f99d8700a..d0f39d5fe 100644
--- a/src/items/ItemStack.cpp
+++ b/src/items/ItemStack.cpp
@@ -48,6 +48,14 @@ void ItemStack::setCount(itemcount_t count) {
     }
 }
 
+void ItemStack::maximizeCount(const ContentIndices& indices) {
+    auto& def = indices.items.require(getItemId());
+    this->count = def.stackSize;
+    if (count == 0) {
+        clear();
+    }
+}
+
 void ItemStack::setField(std::string_view name, dv::value value) {
     if (fields == nullptr) {
         if (value == nullptr) {
diff --git a/src/items/ItemStack.hpp b/src/items/ItemStack.hpp
index 4896bc39e..1ec3fe41d 100644
--- a/src/items/ItemStack.hpp
+++ b/src/items/ItemStack.hpp
@@ -18,6 +18,7 @@ public:
     void set(const ItemStack& item);
     void set(ItemStack&& item);
     void setCount(itemcount_t count);
+    void maximizeCount(const ContentIndices& indices);
 
     /// @brief Set a field in the item stack data.
     void setField(std::string_view name, dv::value value);
diff --git a/src/logic/scripting/lua/libs/libinventory.cpp b/src/logic/scripting/lua/libs/libinventory.cpp
index 2aea52394..9d11d66c6 100644
--- a/src/logic/scripting/lua/libs/libinventory.cpp
+++ b/src/logic/scripting/lua/libs/libinventory.cpp
@@ -2,6 +2,7 @@
 #include "items/Inventories.hpp"
 #include "items/ItemStack.hpp"
 #include "logic/BlocksController.hpp"
+#include "logic/scripting/lua/lua_util.hpp"
 #include "world/Level.hpp"
 #include "api_lua.hpp"
 
@@ -180,7 +181,7 @@ static int l_move(lua::State* L) {
     validate_slotid(slotAid, invA);
 
     auto invBid = lua::tointeger(L, 3);
-    auto slotBid = lua::isnil(L, 4) ? -1 : lua::tointeger(L, 4);
+    auto slotBid = lua::isnoneornil(L, 4) ? -1 : lua::tointeger(L, 4);
     auto& invB = get_inventory(invBid, 3);
     auto& slot = invA.getSlot(slotAid);
     if (slotBid == -1) {
diff --git a/src/logic/scripting/lua/libs/libquat.cpp b/src/logic/scripting/lua/libs/libquat.cpp
index 53757cb36..a3fe62149 100644
--- a/src/logic/scripting/lua/libs/libquat.cpp
+++ b/src/logic/scripting/lua/libs/libquat.cpp
@@ -1,6 +1,8 @@
+#define GLM_ENABLE_EXPERIMENTAL
+#include <iostream>
+#include <glm/gtx/string_cast.hpp> 
 #include "api_lua.hpp"
 
-#define GLM_ENABLE_EXPERIMENTAL
 #include <glm/ext/matrix_transform.hpp>
 #include <glm/gtx/quaternion.hpp>
 #include <sstream>
@@ -31,14 +33,14 @@ static int l_tostring(lua::State* L) {
     lua::check_argc(L, 1);
     auto quat = lua::toquat(L, 1);
 
+    float components[4] = {quat.w, quat.x, quat.y, quat.z};
     std::stringstream ss;
-    ss << "quat"
-       << "{";
+    ss << "quat {";
     for (int i = 0; i < 4; i++) {
         if (i > 0) {
             ss << ", ";
         }
-        ss << quat[i];
+        ss << components[i];
     }
     ss << "}";
     return lua::pushstring(L, ss.str());
@@ -52,10 +54,42 @@ static int l_from_euler(lua::State *L) {
     return lua::pushquat(L, glm::quat(euler));
 }
 
+static int l_mul(lua::State* L) {
+    uint argc = lua::check_argc(L, 2, 3);
+    glm::quat a = lua::toquat(L, 1);
+    glm::quat b = lua::toquat(L, 2);
+    
+    glm::quat result = a * b;
+    
+    if (argc == 3) {
+        lua::setquat(L, 3, result);
+        return 0;
+    }
+    
+    return lua::pushquat(L, result);
+}
+
+static int l_mul_vec3(lua::State* L) {
+    uint argc = lua::check_argc(L, 2, 3);
+    glm::quat q = lua::toquat(L, 1);
+    glm::vec3 v = lua::tovec3(L, 2);
+
+    glm::vec3 result = q * v;
+    
+    if (argc == 3) {
+        lua::setvec(L, 3, result);
+        return 0;
+    }
+    
+    return lua::pushvec3(L, result);
+}
+
 const luaL_Reg quatlib[] = {
     {"from_mat4", lua::wrap<l_from_mat4>},
     {"from_euler", lua::wrap<l_from_euler>},
     {"slerp", lua::wrap<l_slerp>},
     {"tostring", lua::wrap<l_tostring>},
+    {"mul", lua::wrap<l_mul>},
+    {"mul_vec3", lua::wrap<l_mul_vec3>},
     {nullptr, nullptr}
 };