I don't want to wear plug boots anymore, but I do want to use FIS skis occasionally, meaning non-gripwalk compatible bindings. I'd consider GW boots, but can't because of the binding situation on FIS skis. I don't like carrying catracks around just because it's just more stuff to deal with, but I do. I'd consider two pairs of boots, but that seems like an even bigger pain, although I wouldn't mind some coaching boots with some extra room, walk mode, and GW. But I can't see myself ever really skiing in those, just coaching/instructing (there is no skinning around where I live).
In discussions with the rep last year there are a few Marker bindings that will work with GW and designed to work with the WC Piston plate. ( for example: X-Comp16, confirmed w/ rep last season). Depending on the plate interface your using, it could be an option..