Interesting! A new western theme is among the top for me. I don't have an issue with the poker, but I'm hoping it's more western then poker. A few ideas I'd like to see.
1) Instead of a Midnight Madness there should be a Madness at High Noon.
2) Video Mode - I think it would be cool to have a showdown mode where you must draw your gun faster then a computer opponent. When the mode starts you must hold both flipper buttons to prove that your finger is not already on the "trigger". When your opponent draws you move your hand as quickly as possible to the launch button (perhaps a gun trigger). The faster this is accomplished the more points are earned. Hopefully not worth a ton of points, but I think it would be a fun mini-game.