@mitu ok!!! All is perfectly setup. I was doing a bad thing here on the mame´s menu, I thought the button was configured just when I pressed the key in the joypad, but not... I have to press only one time and then wait.

Ok!! alll my problems are solved.

Thanks a lot to all of you.

@Teeqla I was skimming the internet trying to do a project similar to yours and was wondering if you have had any success with the Linux Joystick Mapper and if you might be able to share it if you have?

Blimey, blimey, blimey, blimey, blimey and blimey again! I swear that I'm not a paranoid schizophrenic, but I deleted the config files in /opt/retropie/configs/mame-mame4all/cfg/ rebooted a few times and the erroneous behavior was gone and my settings were not gone even though I deleted the settings files...

Now for that weird behavior from pcsx-rearmed. Maybe that will disappear itself too.

@darksavior you can use the bluetooth controllers and the ps3 driver at the same time. Uninstall the ps3 driver, add all the bluetooth devices you want. Then reinstall the ps3 driver. All devices work. If you want to add more bt devices, remove the ps3 driver again, add more devices, then reinstall the ps3 driver. I have been using all my bluetooth and ps3 driver together for a couple years now with no issues at all. Including my 8-bitdo fc30 pro.

@shoothere You could try this awesome script:

https://retropie.org.uk/forum/topic/1167/here-is-a-way-to-select-joystick-for-players-1-4-global-or-emu-specific

@edmaul69 Awesome. Thanks I'll try that.

Yes, I figured that it was the shortcut, but my concern is less about how to edit the files (I've already done that), and more a question of why the folder has suddenly decided not to show up.