RTS games used to use the shift and ctrl buttons as modifiers when queueing up items, and could be added as a 10x and 50x modifier.
i.e.
shift + LMB will move 10 items.
Ctrl + LMB will more 50 items.
Ctrl + shift + LMB would move 500.
i.e.
shift + LMB will move 10 items.
Ctrl + LMB will more 50 items.
Ctrl + shift + LMB would move 500.