Mod the 360 then all games will be region free
To be clear here, you need to jtag your 360 to be region free<?>. Firmware mods (flashing) only allow you to play bootleg/burns, it does not bypass region. Unless I'm behind the scene and there had been a break through.
Most folks I know that wanted to enjoy both worlds, got a JP Jasper 360 to play imports and kept it un-touched. Then picked up a used US 360 to flash (read: disposable) for burns and domestic releases.