Wow, that explains the .manga* files, I guess they're trying to break into a new market. If I had a K1 then I'd just go this route, but as it stands, the reason why I use Mangle is also for the size reduction by res-changes and 16-color b/w. Then I take those images and turn the gifs from Mangle to .png files which make them even smaller.
You know, lemmie try taking those .png files and zipping them into a .cbz. brb.