Thanks JSOP. I think the key here would be to be watching the market like a hawk, and when it turned north, make sure you catch it as soon as it passes through the moving average so you cover (or go long) and thus miss the huge short squeeze? I think the big worry would be like an overnight change in the market. For example, you are long, and the market opens down 10%, and is already far below the applicable moving average level you are using. Do you sell? Hurts either way if you are wrong!
Yes the whole point is MA indicator and like pretty much all of the technical analysis indicators all go out of the door in the face of sudden and extreme news/economic events even though they are effective in painting a general picture of where the price is going in absence of sudden information.