Like I've said in an earlier post, if people wish to change the graphics for the engine they can't. It won't be that hard to do.
Lol, that can't is supposed to be a can right?
And I have thought of a way of making the sprites recognise one sheet (Making use of the import from strip's selection areas) which includes the animations. So yeah, we should try to sort this out because it'll making graphics swaps much, much easier.