Ever wondered why Steam doesn’t track your playtime and your gamepad doesn’t work while normally steam does support it? here’s a solution ↓
(after you) start up beammp, it starts the launcher and a window of beamng with the play and support stuff options, now go to your steam, to beamng, then click play.
first it will give an error code something like the log is already running, dismiss this error, then click play again
that will open a 2nd window of beamng’s start, this time launched with steam, so it tracks your playtime and supports your controller, and yes, as long as the launcher is active in the background, everything works, this is what I found out I hope this helps.