Low or High
True... the configuration of the Spacewalker doesn't lend well to hovering (control surfaces are small compared to most 3D aircraft, long fuselage....)
The O.S. .91 FS CAN give unlimited vertical climb to a 10 lb aircraft though. (Takes my 10 lb Fokker Dr1 straight up forever [as far as I let it...] at 80% throttle)