If your not commited to a POT, you could use an encoder with a switch to do essentially the same thing (but you would not have the "stops" that a POT has). I love to use these for input devices. One knob is all you need! However, if you have never used an encoder with a PIC there is a bit of learning curve to get them working well. Worth the effort, though (IMO), and lots of resources on the forum/net to learn from.

Here are some from Digi-Key. More options to choose from on other pages as well.

SteveB