Role select

I've thought of something lately, why can't i just pick more then 2 roles. why can't i just 3, 4 or 5 roles but still have a 2 roll minimum. It doesn't seem to hard to add and would reduce queue times. I am probably not the only one with this problem which if you like to play 3 roles, for example: mid, jungle and top, then you have to choose. just make it so you can pick up to all 5 roles and still have a minimum of 2. the reason why fill doesn't work is because you can get all 5 roles but most likely you're going to get support. Riot even admits to it with auto-fill in which people are forced to.