The thing that really bothers me is that you can't really predict if the car will shift or not 100% of the time. This leads to missed shifts or late shifts which throws off my corner line or, worse yet, puts me in the gravel. For instance, say I'm coming into the corner, downshifting from 3rd into 2nd. I push in the clutch (but maybe I don't put it all the way in), blip the throttle, and shift down. When I let the clutch out I find that it never actually shifted after all which means I have to push the clutch back in again but consciously NOT touch the shifter. If I touch the shifter it will double-downshift. If I don't blip the throttle on the second try the revs won't match and the rear tires break loose.
It's all rather a large pain. I wish LFS would make a gear grinding noise if you try to shift without the clutch far enough depressed, then discard your shift attempt. The way that it sort of auto-shifts as soon as it detects the clutch go in just blows. I also hate that you can't stall the car because it auto-clutches for you when you come to a stop.
Proper clutch support is the #1 thing I'd like to see added to LFS.
Hopefully nobody will mind that we're TOTALLY off-topic now.