I'm not sure if the proper protocol is to start a new topic or to append to this one. However, I wanted to add my support to Guardian's request for sprite flipping. Since a lot of a characters' animations are mirror images of one another (e.g. right/left, down-right/down-left, up-right/up-left), roughly 40% of disk space per character animation (3 mirrored directions / 8 directions total) could be saved by implementing sprite flipping in software, rather than the developer needing to include files for the flipped sprites.
For games with a lot of moving characters, this could prove most useful. Thanks!