Really enjoying this beta release. I haven't played with the UI or the TileMap till now and it blew me away. I didn't realise what you'd done but it looks great!
My only final request is when adding attachment points, we can choose position and rotation. Can we also choose a z offset? I.e. On some frames I want my attached object to be behind the sprite, while on others I'd like it in front. (I.e. simple layering).
Perhaps just a checkbox for 'Set behind' as I noticed that the existing z pos is -0.05, so just a toggle to set it to 0.05 ?