untested - creativeFlySpeed, creativeFlyDrag

src/main/java/carpet/CarpetSettings.java

@@ -69,6 +69,7 @@ public class CarpetSettings
     )
     public static int portalSurvivalDelay = 80;
 
+
     private static class OneHourMaxDelayLimit extends Validator<Integer> {
         @Override public Integer validate(ServerCommandSource source, ParsedRule<Integer> currentRule, Integer newValue, String string) {
             return (newValue > 0 && newValue <= 72000) ? newValue : null;
@@ -586,4 +587,17 @@ public class CarpetSettings
             category = {CREATIVE, CLIENT}
     )
     public static boolean creativeNoClip = false;
+
+
+    @Rule(
+            desc = "Creative flying speed multiplier",
+            category = {CREATIVE, CLIENT}
+    )
+    public static double creativeFlySpeed = 1.0f;
+
+    @Rule(
+            desc = "Creative air drag",
+            category = {CREATIVE, CLIENT}
+    )
+    public static double creativeFlyDrag = 0.91f;
 }

src/main/java/carpet/mixins/LivingEntity_scarpetEventsMixin.java

@@ -1,5 +1,6 @@
 package carpet.mixins;
 
+import carpet.CarpetSettings;
 import carpet.fakes.EntityInterface;
 import carpet.fakes.LivingEntityInterface;
 import carpet.script.EntityEventsGroup;
@@ -7,12 +8,17 @@ import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.damage.DamageSource;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.world.World;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Constant;
 import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.ModifyConstant;
+import org.spongepowered.asm.mixin.injection.Redirect;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
 @Mixin(LivingEntity.class)
 public abstract class LivingEntity_scarpetEventsMixin extends Entity implements LivingEntityInterface
@@ -22,6 +28,8 @@ public abstract class LivingEntity_scarpetEventsMixin extends Entity implements
 
     @Shadow protected boolean jumping;
 
+    @Shadow public float flyingSpeed;
+
     public LivingEntity_scarpetEventsMixin(EntityType<?> type, World world)
     {
         super(type, world);
@@ -44,4 +52,29 @@ public abstract class LivingEntity_scarpetEventsMixin extends Entity implements
     {
         return jumping;
     }
+
+
+    @ModifyConstant(method = "travel", constant = @Constant(floatValue = 0.91F), expect = 2)
+    private float drag(float original)
+    {
+        if ((Object)this instanceof PlayerEntity)
+        {
+            PlayerEntity self = (PlayerEntity)(Object)(this);
+            if (self.abilities.flying && !onGround)
+                return (float)CarpetSettings.creativeFlyDrag;
+        }
+        return original;
+    }
+
+
+    @Inject(method = "getMovementSpeed(F)F", at = @At("HEAD"), cancellable = true)
+    private void flyingAltSpeed(float slipperiness, CallbackInfoReturnable<Float> cir)
+    {
+        if ((Object)this instanceof PlayerEntity)
+        {
+            PlayerEntity self = (PlayerEntity)(Object)(this);
+            if (self.abilities.flying && !onGround)
+                cir.setReturnValue(flyingSpeed* (float)CarpetSettings.creativeFlySpeed);
+        }
+    }
 }