1) New Staff: Pit Crews Manager
Something like the real F1 where the pit crews boxing time might affect the race of the team. Right now the pit time is pretty much standardised for all teams, it might be great if different teams have different pitting time due to the skills and different level of the pit crews.
2) Tyres Supplier Varation
Example:
2 Choose 1 for durability (A or B):
A. Goodyear could offer significant SS & S durability, but at a sacrifice for speed.
B. Bridgestone could offer significant M & H durability, but at a sacrifice for speed.
2 Choose 1 for speed (C or D):
C. Pirelli could offer significant SS & S speed, but at a sacrifice for durability.
D. Dunlop could offer significant M & H speed, but at a sacrifice for durability.
2 Choose 1 for wet weather tyre (E or F):
E. Michelin could offer significant wet weather tyre (Inter & Wet) speed, but at a sacrifice for durability.
F. Yokohama could offer significant wet weather tyre (Inter & Wet) durability, but at a sacrifice for speed.
So we can choose 3 supplies in all six for significant speed or durability.
3) Gifting Credits To Other Teams
Something which is send a few credits to other teams such as friends we've made, people who need helped after every races (An additional selection that we can choose for not sending if we cannot afford our financial).