Is there a way to cycle through items inside Base, Production, etc. using hotkeys? Plus I was also thinking hotkey for cycling to 'Select Variant' (i.e. Tab key) then arrow keys to cycle through the variant options? Or whatever hotkey you want. Only option I see currently is move mouse - click.

Another idea, a Search in Zone options (i.e. Carcass, Food, etc.)? Click in the Search and type find the Zone option you want?