Have to agree about the S2 tracks being too smooth and artificial. Yes, they're wider for a reason (to accomodate larger, faster cars) but that doesn't mean they have to have the surface of a billiard table. Westhill, for example, you'd expect to be quite bumpy since it appears as a generally low budget, undeveloped track (unlike Aston, with grandstands and kerbs and configs galore).
Speaking of Aston, it'd be nice to feel the difference in the surface when using (for example) the modern GP config, compared to bits of the old Historic config that aren't part of GP and would be an older, more pitted, weathered, frost-bitten surface.