I'm probably not the first person to think of this but I think it would be fantastic if Riot introduced a system where players picked which role/roles they are willing to play and then match them in a game with players who picked seperate roles. This would be similar to how dungeon finder is used in World of Warcraft. I can't tell you how many times I've joined a game and people have argued over what role they are playing. So for example, I am in the mood to jungle so therefore on the game selection screen I would choose jungle as my role. This tool would then match me with 4 other players who did not select jungle as there primary role. Therefore the argument for who is playing what role is determined.

I was literally about to post a topic about this very idea, i hate going into a game with some friends, ether someone argues over a position, or someone is forced to play a role their not comfortable with. I 100% think they should implement some sort of idea like this, but one thing I've been wondering...

would the game be as fun if you didn't fight over what you wanted to play?
Like, if you got to play the role you wanted all the time, would you keep enjoying the game? isn't forcing you to play different roles what keeps the game fresh?

and on a second note, if we didn't complain about how the games are set up, what would we complain about next? would we complain more about champion balance? elo hell? the graphic style?

Yea i hate the way i have to fight for the role i want to play, yea i hate being forced to play roles that end up making me throw a game, but in the end, that chance makes me appreciate when i get to play the roles i want.

You could always select "any role" and have it randomly put you into a role. I would do that often.

I enjoy the short queue times, if there was role selection like WoW, then we'd be having 45 minute queues. Plus, what's to stop people from choosing a role different from what they signed up for? It's unneeded and like verney says,

I despise the idea of adding any kind of role-queue to the game, for a number of reasons:

1. Team compositions are now essentially chosen by the matchmaker instead of by players.
2. Role queues are a prime target for trolls who, say, choose ADC and then pick a mid.
3. Role queues will not assure that a person is good at their role, nor does it ensure that they will work with our team composition.
4. Regardless of what anyone argues, it DOES stagnate the meta because now you're limited to having 1 jungler, 1 mid, 1-2 tops, etc. See point #1.
5. LF1M support please.

So basically a role-queueing system would solve little to nothing while at the same time introducing new issues into the game which don't need to exist.