Guys, thanks for your suggestions.

In reference to Grant's post this solution would still require user intervention to set the variable at each command line, wouldn't it? Or am I missing something.

I want to try to steer clear of any user intervention wherever possible. Ideally I would want DFS to dynamically recognise which version is being deployed and set the extended properties as such.

Please ask me for more information if you think it would help in finding a solution?