We have thought about reducing power when you get more damage, but this will only work if people use 100% power, otherwise after 2 damage points a car might stop, especially when you use magnets.
It would only be possible as a 'pro 'feature, where you enter a minimum power setting at max damage points, and RCS interpolates the different values for each damage point.
Enforcing a throttle profile is what we did in old RCS version for weather simulation, and we have thought about using something similar for (random) car failure. But a while ago (2-3 yrs) when we suggested this, people did not like the idea.