There is nothing wrong with a 2 position only switch. Just be ready to feed in some down elevator when the flaps kick in. When full flaps are deployed quickly before the plane has a chance to bleed off airspeed, the plane tends to pitch up from the additional lift generated.

Flaps are a barrel of fun and add an extra dimension to your plane's flight envelop, especially if you have a capable computer TX that can do all the fancy mixes.