The game in general needs the ability to Shift-select multiple items in the inventory and drag and drop them, or right-click and do something in the context menu (not ALL context options). This is important enough in regular play, but it's much more necessary in GM mode, for things like removing a player's inventory if they get captured, as in the Mercer stream. Right now having to stop and remove each item one at a time - especially for 4 players is incredibly slow and error-prone.