Got the game booting, but i won't add that version of the 4rd strike hack, i'll add HBMAME's "sfiii3ns07" instead (which is supposedly the same hack under a different rom format), the reason is that's it's a lot more friendly towards our cps3 driver (it's compatible with our current rom loading code).
My mistake, both versions would require changes to our rom loading code, might as well add your version then, i'll need to make those changes clean though.