Suggested

Formation lap

I think that the game must contain a formation lap, for more realistic experience the system would be very simple : The formation lap would start 5 minutes before the race start. Possible positive sides of this idea are : It would be easier to set up the tyres on optimal work temperature (they would heat up easier), and the racing level would be the same (the races would remain intresting), the game would be more realistic, Possible negative sides are that the performances of the car (tyre economy, fuel economy, etc....) will have too much impact. (Sorry if my language is bad, because this is my first ever post on forum), If someone has any further questions please leave it in the posts below, P.S. : If somebody suggested this idea already in the past please ignore this suggestion. 

15 minutes before the race starts you cannot change car's settings and there is the qualification phase.

I might be a bit wrong, I never played that much at the edge, I don't want to miss my setup.

I mean on strategy, not setup for example when formation lap starts you can't change tyre compund on which you would start and you can't change how many times you would pit

Sorry, I wasn't clear.
That is part of what I meant with "car settings", setup + strategy.

I'll try to see if I can change something during the 15 minutes pre-race lock but I think it's already the case, since qualifications use the first compound you chose hor your stategy.