i agree on the point that trucks are not for high speed stunt driving, your suggestion definitely works in a race
trouble is, RC trucking isn't about racing, its just being cruising to show how realistic they are compared to the big things (another thing is that if one truck runs into something, the damage caused to both sides are pretty horrendous)
one can have all the freedom to run his truck at full throttle (on the condition that as long as he doesn't cause problems) and the majority of us also have all the freedom to throw that cock and his rocket truck out of the parade