Replace "Fill" with "Random" in queue selection.
Lets face it, fill = support 99.9% of the time, which is stupid, considering you can only pick two lanes you want to play in, Fill should be scattering you across the other roles in the game, but it does not, it only puts you into support, which as far as I am concerned defeats the entire purpose of the Fill role.
I think it should be replaced with a Random queue option that does what Fill is supposed to, gives you an equal shot at all 5 roles, not 99.6% support with .1% chance at the other 4 roles. If more than one person on a team picks random then there should be an equal chance for those two players to get the remaining roles required by the team, in essence, meaning that Random pick would not be the same as picking support every single game.
There are two main reasons I suggest this, first and foremost is that the Fill role is not doing what it should be doing.
Second of all is the simple fact that queuing a ranked game as Top or Jungle means that you are looking at a minimum 5 minute queue time, with the normal time averaging around 10-12 minutes in length to find a game. It feels like you are trying to force me to play support to get into a game at all, that or bear these insufferable ~15 minute queue times, which is simply not fair to your player base, punishing the players who do not pick fill when queuing.
Remove Fill from all game queues and replace it with Random, a simple change that would make a huge benefit to this game and its particularly bad matchmaking system.
Cheers