Given what we know about some PS3 stuff having issue w/ Trophies/Achievement connections required and some games not loading when the CMOS gets drained - might also be worth checking on Steam-laced games if they can work with a connection offline, Steam not running in background, and while offline.

The further these games lean in required-services and/or propriety online services like Achievements/Trophies/Multiplayer/etc - we'll likely have to check every avenue to make sure it works when offline.