Improvement to queuing system

I was thinking for an idea that could improve the matchmaking system for summoners rift, normals ( others may apply). My idea is that before you queue for a game, you could choose your preferred lanes/roles before a game even started, sort of like team builder. For example if you have a group of 5 randoms, all choosing different roles, the likely hood of players being forced into roles they do not want to play could be lessened. It wouldn't mean you would get a guaranteed lane/role but it could smooth things out. It's an unfinished idea, but hopefully it makes sense.