Fill and second choice

So as of late ive been happy to play any role except support. It's just not a role I particularly enjoy. However, because I like every other roll, I really want to just fill. The problem is that fill really just means support because it's the least common role chosen. So what if, instead of when selecting fill it closed the second choice, the second choice represented one role you can exclude from the fill. Obviously, this would not protect from autofill but it's something to think about that I think would help and definately wouldnt hurt.