This is a rough and ready instructional video on how I modify the type 9 gearbox so that pushing the gear lever forward you get first gear and pulling back gets reverse gear. No other gears just first and reverse.
This is how autotesters can change direction so quickly (see my other videos)
There is still no synchro on reverse but generally the revs are nearly matched and the rear wheels are locked up when you bang it in reverse, well that's the theory at least :-)