The worse aspect of an otherwise wonderful game. A tempy jams on the brakes in front of me, causes the collision, I go down... he flies off unscathed. Hitech, fix the code. If I take damage, he has to take damage, dammit.
Are you serious Steve?
If collisions weren't modeled so that the guy who rammed from behind took the damage, there would be people flying right THROUGH your position shooting, indifferent or even trying to cause a collision, rammers trying to get at buffs or goons when they had no ammo, etc. Alot of overshooting as we know it wouldn't work. "jamming on the brakes" as you call it was done and does work because NOBODY wanted a collision 99% of the time when their life was on the line.
It can seem unfair sometimes, but when you think out all the implications, HTC's way is the best way.
This is the reason why I think we can never go with the option of turning collides off either.