No tanking of the fps-rate when setting the speakers on the system side to anything but the max channel setting (7.1) in F1 2017 and 2018 during the free test, if I did that fps went into slide-show mode.
Aside from that, proper wheel calibration like in AC or PCars so that we can get proper 1:1 ratio.
A changeable steering rack/lock, so that we can set up the car as we want it.
I second
@Emrah1996 call for an option for a full manual formation lap and start.
I would also add manual Pitstops.
@amtoms idea of pre-season testing for R&D sounds great!
Also if we include TV interviews and that they affect certain divisions of the team, not all criticism of a division negatively immediately, you should be able to "grab them by their honour" as it is said in germany, for them to feel challenged to do better by criticism at first.
Only if there is just constant criticism and no acknowledgement of improvement by the driver should the morale in a division fall.