Guess: "play for fun" mode would be good
As some gamers complaining about that they can not make off-meta-picks in draft without being flamed and others complaining about that even norma/draft is too much tryhard I think the above mentioned could be nice.
I mean.... it would not hurt anyone to have "normal, draft, ranked, [and new] fun" as choices. In "fun" mode the "fungamers" can find others with the same aim for the game. No additional programming would be needed. The gamers wich maybe just try their best with a champ they do not main would not have to complain about trollpicks in draft/normal and fungamers have their separate place and can do 3 mid or 2 jungle - or whatever they want to have fun with [in my last draft yesterday the vs tried to do 5 mid ^^].
So - no further programming effort, just an additional queue and noone would be forced to be there. Seems not that bad to me for a solution and if noone would go there it could be cancelled later on as well.