going back to a previous discussion if they made it say a 25MP APS-H that shot say 5 or 6 FPS in H mode and 10FPS in crop mode at 15MP and be able to use EF-S lenses accepting the vignette in H mode vs C mode
it would be totally awesome.
Don't hold your breath... I'm pretty sure I remember a Chuck Westfall interview from a few years ago where he said that the Nikon-style "crop mode" wouldn't be possible due to mirror clearance of the rear element of EF-S lenses on cameras not designed for it. If you think about it, when they designed EF-S in the first place they probably would have made every effort to maximize the benefits of the design by getting the rear element as close as possible to an APS-C mirror while guaranteeing 100% clearance.
Long ago I hacked the plastic ring off the back of a cheap used 18-55 like Bob Atkins did to get it to work on my 10D. According to the measurements Bob mentions in the article the rear element just barely clears the mirror of the 10D, so in all likelyhood you can be pretty sure that an APS-H mirror would whack into it...