There should be a config file in the system folder...like "__rpg" or something and inside that should be a line that says "autorunWithLastRom = 0" or something to that extent. Change the value to 1 and it should boot the last thing you opened on boot. If you don't want to autoboot to the last rom/homebrew, just hold the B button iirc while booting and it will bring you back to the normal menu.