Nope, unfortunately there are no filters aside from friends/world.
I'd like to see one for car type in events that allow different cars and also by nation/region.
For instance, in Super lap 2, I'd like to see where I stand wrt to others who chose the Megane. I drove it because it met PP restrictions without gaming the engine performance like most of the top ~3000 ranked participants did (it's one thing to strip a couple HP if you go slightly over, another to drop tons of HP (R18:291HP, HSV:195HP) in fact) to meet PP restrictions imo. The one is a tweak, the other is for all intents a game cheat no different than employing TCS or the other AIDS so many in the top ranks like love to remind others about when it comes to their standard pretense of "realism" (coughs loudly)).
I don't mind, in that I golded easily and @1:17.xxx am still running faster than a whole lot of HSV/R18/etc drivers who took the easy "gamer's route", but I'm finding it really difficult to discover anyone fast in the Megane, since I have to check each participant one by one to discover which car they're using and I tire easily from encountering page after page of HSV...R18...R18....HSV... at lap times less than that I'm currently running.