Alors si dans le fichier config on rajoute un parmatre de rotation, effectivement ES 'rame' ... pas fonctionellement mais visuellement, les fades sont saccadés et l'interface est egalement beaucoup moins ergonomique.
Alors, ca marche mais ca présente mal !
This exit button is a feature many people seem to want though ...i had it for a moment in my 'picade' since it had an arduino board for controllers recognised as a keyboard, but it was too painful to configure and even enter retroarch menus for instance, even with a keyboard attached, only mame through libretro was 'usable in the end' so i finally flashed it thanks to some english user who made a patch available on github...and now i miss my exit button 
So you say there actually can be one hotkey key for each player ? isn't it useless ?
ok, substring's answer , punctuated with a smile was obviously a way for him to show off his skill in english acronyms while still saying that the answer was indeed in the 'kissing' manual no need to start a fight here .
What baffles me though is your first post where you state you have two hotkeys button .... that is, as i remember my old bartop, just not possible so maybe you have a problem there also....
Le fait est qu'en effet le raspberry une fois démarré puis eteint via le menu reste toujours dans une sorte de veille (y'a une diode rouge allumées en permanence) donc pour etre sur, la marche a suivre complete est effectivement une extinction via le menu (pas extinction rapide si il y a des changements a sauvegarder) et ensuite couper le courant pour une extinction totale ou bien appuyer sur le bouton du nespi case ce qui est déja VACHEMENT plus pratique pour une integration jolie.