I may be wrong as I'm not a physicist and haven't plugged everything into a proper 3d force simulator or anything, but...

As long as forces are counteracted, it should even out in the end. It doesn't really matter much which way the drive shaft turns as long as everything isn't set up to line forces up rather than counteract them, otherwise you end up with torque twist, especially in the air.

As for the motor location/direction, I don't speak for Tekno, but I believe it is for the purpose of making mounting the same no matter if you're using a pinion, long shank pinion, traktion drive, electriclutch, and/or mechanical brakes. This keeps things well balanced and easy to change for track conditions, with the majority of your weight close to the center at all times.