Yes thats basically it, flat pick and fingers or thumb pick and fingers, alot of palm muting and string snapping with the fingernails, scale wise it's rarely pentatonic, quite a bit of major scale, mixolydian, chromatics, pentatonics usaully get mixed together, major and minor, which I guess you could say is a country blues scale, that may not apply to your application but thats the country picker side of it, a great chicken picker who uses alot of different scales is Steve Morse, haven't listened to any of his stuff for years but really liked his playing on the Dregs albums.........