While I do agree, this might require some overhaul of the physics to work.
Suspension is already pretty wonky as is, so I don't know if adding these feature to the current physics model would even prove realistic.
PD could drastically change GT5's physics, but then all the special events and license tests no longer make sense (but they could also make the game switch physics between special events, licenses tests, and racing, but that again might kind of spoil things. Especially for licenses which are supposed to be learning aids).
Also, you should probably start a Feedback request, like I did in the transmission topic [shameless advertising].