Serious question.
I'm pretty sure the RSR software checks your file integrity... the surface materials are in easily writable ini files (eg. content/tracks/magione/data/surfaces.ini) with friction pretty visible, so it wouldn't be too hard to tweak it.Probably not until a protection system is released to ensure the files aren't modded for hotlaps. If it's possible to turn the surface to ice then the other way is open aswell. Having that on RSR hotlap leaderboards wouldn't be a good idea.
You know you can always stick to the base content if you wanted. rFactor doesn't have half as much content by default as Assetto Corsa has in it's early months. You know, that's not a slight difference to consider. If somebody wants to avoid the bad quality of mods, they will be able to, hence AC having tons of content on the base game itself. rFactor is lacking on that case.
This is what I am thinking. The bar is so high on the cars that Kunos make that modder cars won't fit into the game too well. It will be interesting to see.I'd be happy if they only allowed skins. Leave the cars and tracks to the developers as in my experience from rFactor/Race07 etc the quality varies wildly.