Completely agree. While some scores are obvious cheats/mods, others are more subtle. I'm in that group interested in seeing how my scores stack up against others that are not cheating ... which isn't possible at the moment.
While it's going to be difficult for the scoring to be be completely fair even within valid games (due to the patches and changes) they should certainly be considering having a system which confirms it was a valid game for a score to be recorded.