Hello.
This is my first "contribution". I have the steam controller and recallbox 4.1 (17.12.02) With a secondary controller (ps3) to acces the controller options, I managed to partially config the steam controller as a keyboard, wired via USB cable (steam wireless dongle didn´t work). The thig is that I couldn`t map all the buttons, so the thing is that I can map only the arrows, y, x and select / start. very useless in "complex" games.
If there's anything I can test with it let me know.