Again just an idea for future patches.
Elborate the doctors role of the game by giving him staff like psychologists, personal trainer, fysiotherapie, race trainers, thai massage :p and whatever.
These members can increase health, decrease mental atrofie, decreae weight and do whatever you can think of.
Also, make this entire section for subscribers only.
Disadvantage for free users: You need to replace you driver faster and train health more than Subs.
Advantage for Subs: More things to tweek and a minor racing advantage since your driver can be in a better condition.