Can we have an option to disable autofill?

sure!

poof ** your eyeballs drop out of your head and onto the floor **

Everyone should be able to play (and do the role properly) support. Support is a very vital role in every team comp. (Please don't f$#%# play sona if you don't main support, jesus christ). Soraka for example is easily the best support carry champ IMO, you prevent your ADC from dying, and can easily turn 1v3's. (I've had a vayne get caught out, and I ulted and got to her fast enough to keep her alive with w spam and exhausting their damage dealer, free 3 kills for my carry, and I got free assists). Or you know, be like half the people in my promos and qq more when you get autofilled and int and make me lose. Whatever floats your boat.