1. U can play out of ur region games, just do not ever update from them.
For protection u can get pre/priiloader which can block disc updates and u will be OK
(Notice: preloader does not work on 3.1, it only works on: 3.2, 4.0, 4.1, 4.2)(best ver to be in now is 4.1)
3. U should be able to play scrubbed games, they work the same way as regular games(but im using dvd-r and not usb so dono if its diff for it)