Came across these items. They use a 9V battery and simply strap on to your scope/finder/eyepiece depending on the size you buy.
No controller is required, and you can get by without a 12V power pack and long wires everywhere, although they also have a 12V DC input if you want to use them that way.
http://www.tech2000astronomy.com/zap/
For someone like me that likes to keep it simple these sound very useful.
Any thoughts?