I kow someone who has tried a tail locking gyro on the rudder, and it doesn't work. I don't know the major details about what happend, but i heard it was scary... Just pratice, also if you might be interested look into a twin funfly/3d plane. Such as the diablotin twin, or the ripmax extra slim twin, i have both the ripmax i have flown and hovering is a breeze, with a twin (wider platform of thrust?). I just posted pics of my Diablotin twin take a look.