First of all many thanks for your reply and sorry for the retroarch file, I just corrected the first post using pastebin

Your hint was, obviously, correct :-)
I used the tab key and configured some keys for using the controllers.

I changed
User Interface controls:
– Reset
– Load
– Save
Player 1 controls:
– Start
– Select
Other controls:
– 1 Player start
– Coin 1
and also the exit (but I don’t remember where it was)

But I still have some issues.
After I press the save or load button I can’t choose the slot using the controller (issue not important, I can disable the load-save)
I’m not able to insert coin normally, the only way is to press the exit button key, the continue and exit menu appears, if I press exit, the emulator correctly exit, if I press continue a coin is inserted (???????)