Can we select a tertiary role in lobby as well?
This would add a lot more variability for the system to work with before considering auto-fill as an option, even if support/jungle managed to still be the most auto-filled roles.
Many player refuse to touch bot, or refuse to touch top/jungle, or hate solo-laning. Just saying.
Adding a "Fill - except : ______" at the same time would significantly lower the amount of games people are auto-filled for as well, since many players don't select fill because of a single role.
This could even mean auto-fill wouldn't be needed at all until higher tiers.