When I left in 07, I know that FTW paintball was opening in Lewiston, but I believe that has since closed down.
If you want to find out go down (or call) and talk to Dave at Barber/Fly Shop. He owns the barber show down on Main Street next to Subway. He's a pump player and can tell you where to play around the Palouse.
<-- He's the old guy cutting hair.
I used to go down and get my hair cuts by him all the time, cheap and we always talked paintball