In some games for selecting all buildings to be possible to upgrade there is a shortcut like “select all” or “upgrade all”, maybe thats an idea for this game too.
Like every hunter can be upgraded, select only one building and then a button “upgrade all” - all hunters that are upgradeable (of course all the materials must be there) then are upgrading
Shift-Upgrade could be used in my opinion to upgrade from one building all buildings of the same type, I would however limit it to all buildings in the viewport.
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