URF should have a class separation mode

Ever played URF? Sure, who hasn't. I'm sure you've noticed which champions are OP, and you probably see them every game. You can't even have fun in there anymore because everybody tryhards. Let's say you wanna play vayne, sure it'd be great to just kite at 100mph all day. BUT you can't do it because one of the cheese champions that everybody spams in URF will just 1 shot you. I think Riot should put in an option to choose which role you want to play, Assassin, Mage, Marksman, etc. so that the match will be more balanced. Of course, don't take out the normal mode where any champion goes, but why not throw in the class separation? Would make things much more enjoyable for people who don't enjoy getting 1 shotted by the same 6 champions every single game (i.e. every person who ever played URF). Thoughts?