(hopefuly, you can see which of these are just additions just for kicks and which are serious)

1. A proggie to convert GPS data to a map, or at least help in the creation of a user track. Not really an LFS addition.
   
2. Button which makes the driver model get out of the car and pee on the grass. For when mid-race you just HAVE TO GO.
   
3. Locked wheels while braking make flatspots on tyres, which affect handling.
   
4. Fixed gear ratios. Come on, gears in gearboxes don't have SO many teeth that one can get ratios like 1.658... I mean, IRL you can't have so much freedom with gear ratios.
   
5. Too fast gear shift -> damaged synchromesh -> gear may not engage (for those using manual clutch or H shifter).

I honestly think i had more in mind... can't remember now...

#3 is actually already in the sim.

1. Maybe S3 wil have track editing.
2. Not really necessary. But would be cool . Actually needs alot modelling...
3. In sim already
4. Yeah, but not too less of them.
5. Umm... Yes

#4 - don't make me walk over to Greece and beat you.