When you need to type a sprite's animation name into the event editor for whatever reason, it can be misspelled(sometimes not noticed by the user and causing event(s) not to work) or if you've forgotten one of its names. You have to jump out of the event editor and to the layout page to click on the sprite(s) to view its animation(s) list to view all the animation names. You then have to navigate back into the event editor to type it in.
So although a bit trivial it would be a nice addition and can speed things up by having an "animation name list" of the currently selected sprite to which you can just click&select to be inputted into your logic/coding etc