There was some development a little while back with the SDK's, was there anything in them that anyone found useful?
Given that the tide is turning from CS:S to CS:GO in terms of both fresh updates and player counts it is probably time to start taking it more seriously as a potential for the next Z:R release. Take a look at the last 12 months of Steam stats for both games:
http://steamgraph.net/index.php?acti...=1388494800000
I don't mean to sound pushy as I know like anyone else this is a hobby for you but I'd hate to see Z:R get left behind.