Quote from AndroidXP :

Yes, we're not talking about clutchless shifts (which you can already do in LFS) but the ease of clutched shifts. If you're for example in second gear you can just put the stick in third (you "preselect" it), wait till the shift point is there and then quickly press the clutch. That way you make an almost instant shift - much easier and faster then it's supposed to be.

There would be an equipement issue too! With a real car you can't move the stick if you don't push the clutch. Idealy your G 25 (if it s what you 're using) would block the stick until the pedal is pushed! If the game doesn't allow the preselection then we will end up with another irealistic thing. I mean having the stick into on a certain gear but with no change in gear forcing you to do something that would never happen in real life!
I don't know if i m really clear here sorry

I think part of the problem is actually the current realism of the transmission. When you preselect a gear, it's like the ingame driver is applying a constant force on the gearstick to the gear you want to change to. However, as long as the transmission is under load, it won't let you out of the current gear, which allows you to continue driving in it as if nothing happened (as long as you don't lift the throttle or drive over bumps that could cause the transmission to be temporarily unloaded, it will stay in gear). Then when you finally press the clutch it will let the gear slip out, only to be immediately placed in the next gear.

Ideally, we'd have a shifter that would actually physically prevent us of preselecting, but I don't see that happening anytime soon. If, however, we were to accept a little less realism, as in allowing the gear to slip into neutral no matter what, that would effectively prevent any preselecting. To be honest, I'd rather have a little less realism in the current transmission system in exchange for a lot more realism in the way you have to do gear shifts.