There are lots of good uses for ISO's besides piracy, like saving battery power/killing load times/possible to add your own custom soundtrack to some games ala Castlevania X/Also patch Castlevania SOTN in DXC for full screen/etc. Saying you don't want to use them soley because it automatically means "PIRACY LOLROOPO" Is kind of ignorant
I'm now changing my PSP fw vote to 6.39 PRO-B8 Nightly builds, someone released a Popsloader plugin so now there was no reason holding me back. Runs everything, has built in memory stick speedup that makes stick reading WAY faster, all around great! Theres a good all-in-one setup with the FW + Popsloader modules, if anyone wants it send me a pm. Installation is really easy too, you just update to the official firmware version then install the cfw from XMB, no save exploits etc required