please hear me out.
There are requests for more setups options. I would like to suggest 5 areas for tweaking
Front aero
Rear aero
Front suspension stiffness
Rear suspension stiffness
Ride height.
Keep the adjusters from 1 to 50 but hang on, there is a catch.
The driver doesn't know what the "ideal" setup is. There could be a range around ideal for each stay that the driver says it feels good.
Example: front aero = 20. Driver says it needs to be increased. Manager changes it to 28. Driver says it is good. Ideal was 29, but anything between 27 and 31 driver would say ideal. Also, these true ideals should vary by track temp a bit too. Hot air is less dense so more aero is needed etc. Paying for the ideal setup could put you anywhere inside that range of driver's ideal range. It would be hard to get the setups immediately (given the variability of ideal stat and the range surrounding it) and would add a level of getting the car right for a track more than your opponent who is often running the same setup as you.