Re vmcg, and HS 125-800.
As I recall the aileron effect for steering was sufficiently strong to discuss its use with the regulator to reduce vmcg.
Regulator's response was that pilot input could not be guaranteed; counter argument was the similarity with rudder input. Regulator muttered cross wind, wet runway, … end of discussion.
Re thread question: From those who have experienced the effect / need of rudder input, any difference with runway condition, dry - wet ?