re headtracking, use OPENTRACK  https://github.com/opentrack/opentrack/releases  to convert VR HMD yaw, pitch & roll to TrackIR which TDU supports natively.   Or you can (1) buy https://edtrackerpro.mybigcommerce.com/ or (2)  build your own cheap headtracker  with software and instructions from http://www.edtracker.org.uk/   and with an eBay or AliExpress sourced Arduino Compatible Pro Micro (ATMega 32U4) - 5V/16MHz and a 5 volt MPU-9250 sensor.  (MPUs 9150 and non-m