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Hello Robbie !

Just a quick not to help you find a solution for 4). Have you played Age Of Empires 2 ? there is many buildings in this old gem, more than a keyboard could handle, so what they do is they split buildings by category so that you press 1 key to select a category then another to select building within selected category. I believe it would fit nicely in your game since you already have categories as well :)

I've certainly played a loooot of AoE 2 :P

Worth considering something like that. We're gonna overhaul the tool panel at some point, so we'll see what that looks like first.