After searching (and found not even a single mention in any thread)... I'm writing to request a game, AssaultCube... it already can be run as portable (unzipping on PDrive and running from there) but it doesn't keep the settings/profile so a launcher is needed...
Can anybody do it?
uh! http://assault.cubers.net/
And it is GPL...
AssaultCube, formerly ActionCube, is a free first-person-shooter based on the game Cube.