Thanks! This is awesome. I'm on the final step and seem to be running into an error when using the Create Animations button though. I believe I followed the guide properly. Here's what I'm getting:
IndexOutOfRangeException: Index was outside the bounds of the array. MSCUnityEditor.CreateSpriteKeyframes (UnityEngine.Sprite[] sprites, System.Int32[] spritesNumbers, System.Single[] keyTimer) (at Assets/MSC Animation Creator/Editor/Scripts/MSCUnityEditor.cs:289