Hmm... couple questions about the hack:
1) What's the size overhead for this? Like, how much space does it take compared to the old CMPR format icons?
2) Could this be potentially used to create a Smash4-like CSS, with an animated background behind transparent selection boxes?
1) With both of the MiscDatas added in, it adds about 30kb. It is a significant amount, but if you switched the format back to CMPR, you would actually be saving space (even without the MiscData30 from Ondo's less Compressed Csp's).
2) That's actually one of the reasons I did this. I haven't done it yet since I'm still looking for someone to recreate or rip the background from the Smash 4 icons. I'm not exactly sure if the background can actually be animated yet though, but it should be possible.