I disagree, tyres in LFS are pre-warmed to race temps already.
the road tyres in LFS are pre-warmed to 40Deg C, and the GTR/SS slicks are pre-warmed to 80Deg C, which I think you'll find is what race tyre warmers warm tyres IRL too.
They DO start race ready, if they didn't they'd be ambient temperature and would be a nightmare to drive on, don't let the blue/cold display on the tyre temp display fool you, LFS tyres ARE pre-warmed to race temps already.