Last night I saw a rather irritating beacon placement that I would consider a game bug rather than strategy.The map was Volcano and somehow one of the GDIs got a beacon inside our powerplant. It was "embedded" into a purchase terminal. None of the engineers, including myself, could disarm it because the game kept highlighting the purchase terminal assuming we wanted to buy something.
I think what he did was jump onto a small lip that is part of the bottom half of the terminal. Its enough surface to drop a beacon onto.