I would only add USB external drive or HDD support, and access to the SEN/PSN store for PS2 and PS1 titles. Perhaps compatibility with PS3 controllers too, I´d like to use a current arcade stick with it.
Sad. This is the era for the jRPG fans. Kinda disappointed in this generation when it comes to jRPG's. Sure there was a few good ones, but not like the PS1/PS2 days.