Chuck said, "I REALLY have to learn to left foot brake by habit."
Chuck and others considering going to left foot braking, while this sounds good in theory, it's a lot harder to actually go faster than your normal right foot braking than you think...and is something you may want to give careful consideration to. I have no doubt that left foot braking (if done correctly) in the Mini and most other cars is going to be a bit faster. Unfortunately, I believe it's a vast minority of drivers who can actually drive faster while left foot braking. Great drivers like G.H., Chiles, Matthew Braun, and scores of others are awesome left foot brakers, but they also get beat by right footers pretty regularly. Tim Aro, Sam Strano, and Telehowski are two examples of exceptional drivers who still use their right foot.
As an example for anyone considering the change, I truly consider myself to be of average talent as a driver...I used my left foot on the street since I was 19 and during my first 8 years of autocross. I had decent success in the state and nationally as a left footer. Upon the advice of Brian Priebe I gave it up in the middle of the 2002 season and went to right footing in the Spyder, due to the unique handling traits of mid-engine cars. I *immediately* went faster that season, won the Midwest Divisonals (i.e., Nationals warm-up in Topeka) and then got my first trophy at Nationals. The following season I got two national wins, some other nice wins and seconds and was the only person to challenge Telehowski all season. Now, I'm back to being a hack, but I attribute the drammatic improvement in my performance back then to using the right foot.
I have no doubt that there people in the club who will actually go faster if they try left footing and stick with it. I also have no doubt that there will be folks who think left footing is a "silver bullet" that's going to chop a bunch or even a little time off of their average run - many of those drivers will end up disappointed.
Most folks will benefit more from focusing on improving their fundamentals than changing to LFB. The problems a lot of left footers have is braking too much and too abruptly. Coincidentally, those were my biggest flaws as well. The right foot gave me better pedal feel and made it easier for my simple brain to say, "get off the damn brake and carry some energy in the corner." Also, having the left foot on the dead pedal gave me a more stable platform for feeling the car and providing the car with throttle and steering inputs. G.H. and I were talking one day at a local test and tune in Peru and I commented that I noticed the less I used the brakes the faster I went, in general, this was a concept we agreed upon.
This is just one person's perspective. My main purpose in commenting is to reassure drivers who RFB that it's OK. The grass always seems greener on the other side, even though that's not always the case. If you're getting beat or beaten badly it's probably not becuase of the appendage you choose to brake with. Once again, left footing is great if you either 1) have the talent to do it correctly, or 2) are willing to work at it for a long time. If you're interested in trying LFB, definitely give it a try for a few events, but remember it's not something you learn to do over a weekend and will likely take a lot of work to actually see improvements.
Remember that a good RFB will beat a mediorce or poor LFB every day. I have no doubt that I'll end up in a car again that will benefit from me LFB'ing, but it's a decsion I'll have to think about a lot.
It would be interesting to hear G.H.'s perspective on the topic since he's one of the best brakers (either foot) that I've seen or ridden with.
As far as ME giving lessons to 2-5 in HSL, I'm sure she could and they'd all be faster afterwards...as she has also probably instructed and helped just about every driver in THSCC get faster, myself included, and I believe this year the #1 HSL driver at Nats as well

We really are lucky to have some many talented and helpful folks in this club.
Eric