I only mention the PS3 gamepad specifically because Ive noted some discussion previously in other contexts that it doesn't always pair like regular bluetooth controller do, but once paired plays nice.
if Jolla shipped all the profiles
and how things were exposed to GUI apps
or Alien Dlavik.
It occured to me at work today that the Android builds of PPSSPP would likely work well on my SailfishX and was thinking about how exactly I wanted to do the controller end of things if I go that route.