Scratch

Sorry for the double post! D:

But I had another inspiration. So let's say you want to make a sprite repeatedly moving their arms or something, so  you make all the necessary costumes and set  the "Forever/Repeat (#) - next costume - wait 0.001 seconds" or whatever script. But what if you want to make another costume loop for that sprite? It complicates things a bit to switch back to a certain costume all the time, change costumes however many number of times, etc. Soooooo, if there were little groups that could be created for each different big movement you wanted the sprite to do, you could just have a block to switch costume sets and use a loop from there.
Me having tried to make sprites do way too much, I think this would be helpful... possibly hard to perfect and implement, but still helpful.