path relatvie to your install: C:\Program Files (x86)\Steam\config\steamvr.setttings
you can add things like this to map controller buttons to things…
“psmove”:{“circle”:“a”,“cross”:“button_8”,“meters_per_touchpad_units”:0.07500000298023224,“move”:“touchpad”,“ps”:“system”,“rumble_suppressed”:false,“select”:“button_9”,“square”:“grip”,“start”:“button_10”,“triangle”:“application_menu”,“trigger”:“trigger”,“use_spatial_offset_after_touchpad_press_as_touchpad_axis”:true}
my whole file looks like this (which is wimpy compared to most).
{“audio”:{“onPlaybackDevice”:"{0.0.0.00000000}.{0cc3d82a-01f6-4c21-9a71-b275e63f06be}"},“driver_vridge”:{“renderScale”:0,“windowHeight”:936,“windowWidth”:1664},“psmove”:{“circle”:“a”,“cross”:“button_8”,“meters_per_touchpad_units”:0.07500000298023224,“move”:“touchpad”,“ps”:“system”,“rumble_suppressed”:false,“select”:“button_9”,“square”:“grip”,“start”:“button_10”,“triangle”:“application_menu”,“trigger”:“trigger”,“use_spatial_offset_after_touchpad_press_as_touchpad_axis”:true},“psmove_settings”:{“psmove_filter_hmd_serial”:“00:06:f7:d6:f1:e1”},“steamvr”:{“activateMultipleDrivers”:true,“background”:"#FF000000",“mirrorViewGeometry”:“0 0 720 1280”,“playAreaColor”:"#003CFF2B"}}