@zing Thank you so much ( and thank to my pi400 keyboard ) i could get to the menu.
From my understanding now, i will need to do the menu trick one by one, as the global setting seems to don't affect the games at all.
So i enter the menu, create a game config each time, and set the Hotkey as Select...then the heat is on. Select+Start=exit.
Besides it allows me to do a set the graphic/sound/control for each game, like i did for my collection in Retropie. So much better as not every games react the same to the Buffered/Skip buffer rendering.
Overall, it rocks solid.