The OCE League of Legends community is quite small compared to others around the world so when it comes to ranked Auto-fill seems to always be active. This can raise problems when put into a role you are not confident with.
To help with this problem i suggest having the client tell you that "You have been auto filled as _ this game, do you accept?" and if the player accepts, everyone is happy, If he does not accept it puts him back in queue and black lists him from being put as that roles for X mins.
As a thank you for people being auto filled in a role, and to encourage people to play outside their usual role, there could be a small reward for players who agree to the auto fill constantly.