Hello. I got a few ideas. Sometimes race is won in pit and everything depend on pit stop.

1) It will be nice if we can have little more detailed settings on what should be repaired - in F12/new pitstop panel.

2) See estimated time of repair for every part - in F12/new pitstop panel.

3) Usually, All tyres are changed in same time but in lfs it is - changing first tyre -> second -> third -> fourth. This will really faster.

Quote from NoNder :

3) Usually, All tyres are changed in same time but in lfs it is - changing first tyre -> second -> third -> fourth. This will really faster.

Usually one tyre after another is changed in motorsports. Only in higher levels you find teams with enough manpower to change more tyres at a time. In the special case of the BMW Sauber I have to agree with you, but in GT categories you usually have personal restrictions allowing you only a few mechanics to work, resulting in, at max 2 tyres are changed at a time.
If you see here the GT1 World Championship, only one tyre at a time was changed: http://www.youtube.com/watch?v=aXbyeJFhq10&t=42m16s

Quote from NoNder :

1) It will be nice if we can have little more detailed settings on what should be repaired - in F12/new pitstop panel.

2) See estimated time of repair for every part - in F12/new pitstop panel

Good point, because sometimes when I get serious damage I lose up to 30+ seconds doing a pit. Selecting separate parts to be repaired would not cost me that long.