Can use a toggle switch, no prob. But you have to remember that to power it on, you have to flick it on, then off again. If you leave it on, it will just power off. I have mine with a keyed switch, same deal.
Edit: Not sure about those with the 3 prongs, though. I've just tried the 2 prong ones.
a 3-prong is like a 2-prong, but you can know when it's off. For example, there's a "common" prong, and a "trigger" prong in a 2-position switch. In a 3-position switch, you have 1 common prong, and 2 triggers -- 1 for off, 2 for on.
to use a 3-prong as you would a 2-prong, leave one of the ends disconnected...