Great extension, but I found an issue that stumped me for a few days. in device_mouse_check_region_gui() if you feed it allignment (in my case fa_left and fa_top) it will only check for device 0, not whichever argument it was passed.
I believe the error is in line 129 & 130.
It's also possble that i'm using an older version of the extension, in which case disregard