After the .79 update it's annoying finding outdated servers and trying to connect to them. To fix this could you remove them (Like a protocol), so if the server is running a old protocol it won't be advertised in the master server list.
Thanks.

But the pirates might want to play with an old version if the new one hasn't made it to torrent yet

Seriously though, it could be made to the game itself to filter out servers with unmatched version.

I was thinkining maybe you use a master list which is on your website (The one you have). And if you click on it, it is a protocol like rwr://SERVERID. The game is launched and you start from there. Through you could add at the top left "0.78" and it shows all servers which are 0.78. I think it would be quite a cool idea.