you do get very used to the feeling after you drove or driving a rhd car.that is what makes humans conquer other species due to our adaptabilty in any situation. im sure there are plenty of awesome racers who are right handed but drive a rhd car.

and in terms of tuning....i say being familiar with your car is the most important aspect and not wethaer it is rhd or lhd....or even worse whether your right handed or left handed. and most autocross racers dont shift so fast anyhow.......they shift quickly but not like dragracing where they concentrate on the shifts and force it in..road racers can make up the shifting time with concentrated braking and accelerating over the tenth or so to shift....road racers consentrate more on setting up for the turn then shifting....and most dont even look at ropms...they "feel" them along with bouncing off the rev limiter to know when to shift.

how hard is it to operate the radio with your left hand? or to slide the climate control over for ac or whatnot. cmon now...

and i did read most of why roads are rhdriving over lhdriving.....very interesting stuff and the whole idea isnt stemmed from left hand or right hand people. if this was the case...then everyone would be driving on the same side of the road. the idea is based on what that culture was used to and what lawmakers of that country were used to during the horse era (if you will). the lawmakers were a select few who were used to passing humans/horses/carrying swords/ getting out of the kings way by procedding to the right. this way of "right" carried on through america.