Heck, I would be tickled pink if the dev announces and updates the app to support pbp files. Not seeing how this question has not been asked more, considering the HUGE space saving that would result. Eboot pbp files makes far more sense than 600mb to 700mb images. Sure, some game only work if in ISO, NRG, IMG or BIN format, but per my test of over 300 roms, over 90% work perfectly in pbp format. I converted them for the PSP and they play with PSX4Droid too, but that app is sllloooow compared to the amazing FPse. I compared BIN file and ISO roms on both PSX4Droid and FPse- FPse is far more efficient and works better with far more games.
Considering we are using mainly phones for this and most tablets do not have USB host for thumbdrives (my gTablet and Iconia does). I stuffed a 64gb thumbdrive with roms, but they would fit in a fraction of sapce and the internal space in pbp format (I should know, since have in both).
PbP file format for the win!