I know, I know, this has been said 1,001 times before. However, there's one huge bonus - you don't have to worry about the copyright strikes that you might gain from modded tracks being copied from other games, however if you were to make an in-game editor for tracks, then the modding community would quiet down. This would bring attraction to lfs and would , if lfs s3 only, bring you quite a bit of money( from me at least ), and make many, many lfs players happy.
However, you should probably lock it to s2 or s3 as some people would make copies of the in-game tracks, reducing the demand of licenses.
This update would be a huge undertaking, and would be a large update with lots of playtesting(buildtesting?),but would be an amazing update. Nordshliffe anyone?