The short shifter may fix the problem for them. It's possible that they're just letting the clutch out too quickly since the 2-3 shift is longer. The SS would reduce the shift time and their letting out of the clutch too early wouldn't be a problem anymore. The bushings probably won't do crap for fixing the grinding, but it will make the shifter feel more precise and less mushy.
I've only grinded gears twice on this car and those times were when I was still learning. Yeah this is my first manual car, maybe i'm just not shifting fast enough for it to happen, I dunno. I do go WOT in 2nd, 3rd, and 4th gears pretty much daily and I never have a problem with grinding, before or after my bushing install. Could just be a lucky transmission or i'm just not shifting fast enough for it to happen.