-1
It undermines the purpose of the sand...thats a corner that alot of people wreck in (Depending on the config) ... the idea is that a little screw up doesnt completly cost you the race.
Honestly, I have never seen people do it. I'm sure they do (they do everything) but I can't say its a problem.
Besides, they might be faster for that lap, but when they get to t1 (ok, maybe not t1, t1 is fast) they wont have such an advantage, with busted suspension. Especially if they do it a couple laps straight. Besides...I see anyone do it, obviously and intentionally, I'll take them out (if not in an Admin'd server of course) ... I will throw a race to keep someone from getting away with cheating...im here for fun, the win i secondary (and honestly, rare)