- Pitstop timing adjustments for each team
- Damage coefficient
These two things can currently be done with Madman's GP Tweaker. However, as far as I know, we cannot do different levels for each team.
- Tyre grip against surface
This cannot be done for each team. We can lower or raise the players grip, like it is done in Belini's GP4 Team Career. You can lower or raise the skill of each driver, and so long as you do not make too radical changes, it will look pretty convincing. The limit is when you begin to affect the driver skill compared to the AI code. Lower or raise it too much and a driver develops nerves of steel, or panics once he sees you in his mirrors.
However, what would be just as interesting would be independant failure rates for each driver. Making a proper 2002 carset is quite a challenge since Rubens should have high failure rate, while Schumi's should be 0. This is one of the reasons that people prefer carsets for each track.
- Independent car control style
Cannot be done at the moment. You can load a new physics file with GpxPatch, but that affects the entire grid, not just one car/team.
It's only after we've lost everything, that we are free to do anything.