I have the Wilco payware Harrier.
I just love it. Wilco have written bespoke code that allows the pilot to use the Pitch control to set the nozzle rotation. It also has a nozzle gauge in the VC and as a pullout.
STOL is fairly easy especially takeoff, VTOL takes some getting used to. Again takeoff is easier than landing, and having a leaver prop pitch control is a must to get it right.
Side slipping and rotation are possible, but you must be in an almost stationary hover to do this. Side slip is achieved by banking and rotation by use of the rudder. Do both together and you will c