So far, I am using the custom race mode:
- no opponent
- 10 lap race
- No Quali but a 15 minutes warm-up
- Sunny weather, day time (or rain at the level you want if you are doing a "wet" compatible tune).
The first time I enter, I have to set-up the race with those specifications but then, if I exit, I can relaunch in 2 clicks with the same config.
1/ When entering the event, I am in warm-up, I pause then "go to pits"
2/ Here, I can do my tune adjustments
3/ When it is done, I just click on "go to end of session" (warm-up in this case), and the race is automatically launched.
4/ Then the race start with tyres and breaks ready and at the same temperature every time I will repeat the process.
5/ I drive a few laps (or a few corners if adjustments are crap) and exit the race.
6/ I think to the needed changes
7/ I repeat the process from step 1/
I never drive in warm up as the tyros are cold, I only set a warm-up to be able to do the tune adjustments without having to go to the "My garage" section.
The time attack mode can be used to but It would not work for rain tunes unlike he above approach.