I was watching F1 race the other day and this thought crossed my mind: is it possible to change pit tactics mid-race in LFS? I mean, put on softer/harder tires, o add less fuel on second stop and etc.

not mid race as far as i know, i've thought the same thing before.

Yes, you can use the F11/F12 (its one of them, or both) menus to change camber/pressure/compound which are then adjusted when you pit. Also refuel amount and whether or not to repair damage, damage is automatically repaired if you make setup changes.

Yes in F12 you can also change the downforce, and in F11 you can change the brake bias if i am right.

Quote from G!NhO :

Yes in F12 you can also change the downforce, and in F11 you can change the brake bias if i am right.

And Front/Rear arb on GTR's and FO8 + BF1

And one silly option you should never use, that sets your wheels pressure / camber to symmetrical... can be renamed as race end