I think the tyre changing system should be overlooked, and maybe multiple ideas implemented. The current % method works fine, but another cool method would be the ability to manually say "Change my right front and my right rear only."
I'm an oval racer, and this would probably only affect Oval racers immediately. It's just on lap 88 of a 270 lap oval race we were forced to pit (and change tyres), which screwed up my tyre strategy, and I had to work out on the fly how much % wear my tyres had. And I still screwed it up.

EDIT: I also searched this topic and got nothing, so ha Deko.

I've been screwed multiple times by the % system, and even for road racing would love an option to just replace one tire.

Some tracks only cook one of the fronts, or just the rears etc, and its actually beneficial to keep the other tires warm.

+1 to the whole "choosing what tyre to change" thing. Not having it has always bugged me.

Yeah not too many tracks are even, especially when you're rocking the FWD cars.

+1

Would be useful for plenty of races that only harm one of the tires.

However, it should be a server-side option - so people in leagues should be able to make it compile into their own rule set.

This is something I've suggested many times. I have no idea why we use the percentage system. It's extremely unrealistic and a general pain in the ass to use.

It would be a good thing to have, so its a +1 from me. It annoys me when the system only changes 2 of 4 tyres due to one side being 1% better then the other, so then i end up with 2 fresh tyres, and 2 worn tyres, which obviously screws up my race. Can prove annoying.