I realize this has been mentioned, but the threads were fairly dated, so I thought I'd start talks afresh.
I'd love to see some gunslingers for Tombstone that mirror the Race options available in Cutlass. I think it would definitely be a boon to the range, especially should a Tombstone game come out.
I'd also like to see some Wild West Critters. Like a Rattlesnake. Or a Jackalope.