OK, this will probably be the only feedback I offer for this game (mainly because I don't normally hang around forums and whatnot). I like to play, but now that I'm trying out ranked games with the league system, it's fairly clear that something is missing.
I like to play AP and I've been improving on my ADC skills, but every team I get matched in, someone calls out "mid" or "adc" or "top" as soon as they join. Then the team scrambles, trying to figure out bans, roles, lanes, and we end up with a confused mess. I suppose teams skilled with players who can play every role do well, but I don't play all day, every day. I'm working to be good in a few specific roles, so I can have fun doing so, and win (which = fun, of course).
So, the suggestion: allow summoners to choose a role/lane combo (or several that they're comfortable with), and match teams up accordingly. This way, I (and others like me), don't have to play support or jungler, when we've been honing our skills on tank or carry.
Best of luck in continued success with patches, improvements, and overall game development.