• fly in / fly out / no motion
• enable / disable following cursor (as requested here)

How about a 90° or 180° rotation? (Clockwise when opening, counter-clockwise when closing)

Yup, that would also be neat!

Animations are not yet supported in the Classic rewrite. The Secure Execution API of WoW tries to restrict the ability to change the position of clickable action buttons on the screen. I have some ideas how to get around this, but it will require some additional effort.