ok my friend is buying a duratrax street force GP and is using "build your own combo" at towerhobbies.com and is wondering what radio to select. he has narrowed it down to two the Futaba 2PH and the Futaba 2PHKA. the 2PHKA has "dual rate steering and the 2PH doesn't.....what is dual rate steering and what would you recommend for a intermediate driver who is not looking to competitively race with it...