A friend played a fast one on my team in a multiplayer(6players) fleet action. He had a Romulan ship Cloak, and he lowered shields.
Since the only thing you see is shields, it was super tough to find that ship. There is only the faintest of image to see, and I mean faint!!.
In a fleet action with all the other stuff going on it is damn near impossible, and of course he got his ship into fine position without anyone knowing about it.
Thought you other folks might like to try that on someone some day. Only works once, and if you cycle though targets it will be detected(which we all do now), but still had me nearly snarf my beer out my nose when it happened.
Scott