This would be a huge timesaver for me, personally. Would love to have it just auto-select my level 1 food when upgrading rank. Obviously, it should only choose champs that are not locked, and it would be great if it only selected level 1 food to avoid having situations where you eat food you wanted to upgrade instead.

Same thing for auto-select level 1 food when upgrading level, except in this case I think it would be better to have a button which would let you choose from three options - auto fill slots with level 1 food, with affinity-specific potions, and with any potion (would default to choosing the one you have most of).