--- a/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -370,6 +_,7 @@
                 }
                 return false;
             }
+            if (this.player.level().purpurConfig.slabHalfBreak && this.player.isShiftKeyDown() && state.getBlock() instanceof net.minecraft.world.level.block.SlabBlock && ((net.minecraft.world.level.block.SlabBlock) state.getBlock()).halfBreak(state, pos, this.player)) return true; // Purpur - Break individual slabs when sneaking
         }
         // CraftBukkit end
 
@@ -500,6 +_,7 @@
     public InteractionResult useItemOn(
         final ServerPlayer player, final Level level, final ItemStack itemStack, final InteractionHand hand, final BlockHitResult hitResult
     ) {
+        if (shiftClickMended(itemStack)) return InteractionResult.SUCCESS; // Purpur - Shift right click to use exp for mending
         BlockPos pos = hitResult.getBlockPos();
         BlockState state = level.getBlockState(pos);
         boolean cancelledBlock = false;
@@ -548,7 +_,7 @@
             boolean haveSomethingInOurHands = !player.getMainHandItem().isEmpty() || !player.getOffhandItem().isEmpty();
             boolean suppressUsingBlock = player.isSecondaryUseActive() && haveSomethingInOurHands;
             ItemStack usedItemStack = itemStack.copy();
-            if (!suppressUsingBlock) {
+            if (!suppressUsingBlock || (player.level().purpurConfig.composterBulkProcess && state.is(net.minecraft.world.level.block.Blocks.COMPOSTER))) { // Purpur - Sneak to bulk process composter
                 InteractionResult itemUse = state.useItemOn(player.getItemInHand(hand), level, player, hand, hitResult);
                 if (itemUse.consumesAction()) {
                     CriteriaTriggers.ITEM_USED_ON_BLOCK.trigger(player, pos, usedItemStack);
@@ -594,4 +_,18 @@
     public void setLevel(final ServerLevel newLevel) {
         this.level = newLevel;
     }
+
+    // Purpur start - Shift right click to use exp for mending
+    public boolean shiftClickMended(ItemStack itemstack) {
+        if (this.player.level().purpurConfig.shiftRightClickRepairsMendingPoints > 0 && this.player.isShiftKeyDown() && this.player.getBukkitEntity().hasPermission("purpur.mending_shift_click")) {
+            int points = Math.min(this.player.totalExperience, this.player.level().purpurConfig.shiftRightClickRepairsMendingPoints);
+            if (points > 0 && itemstack.isDamaged() && net.minecraft.world.item.enchantment.EnchantmentHelper.getItemEnchantmentLevel(net.minecraft.world.item.enchantment.Enchantments.MENDING, itemstack) > 0) {
+                this.player.giveExperiencePoints(itemstack.getDamageValue() == 1 ? -2 : -points);
+                this.player.level().addFreshEntity(new net.minecraft.world.entity.ExperienceOrb(this.player.level(), this.player.getX(), this.player.getY(), this.player.getZ(), itemstack.getDamageValue() == 1 ? 1 : points, org.bukkit.entity.ExperienceOrb.SpawnReason.UNKNOWN, this.player, this.player));
+                return true;
+            }
+        }
+        return false;
+    }
+    // Purpur end - Shift right click to use exp for mending
 }