it's too bad that when you have server with multiple games when you change one it shows that server is down...

If the server is on the same query port with the scame query protocol, it will work. However, if either of those are different then it will not work. For example, a server at :28960 in COD1 switched to the same details in COD2 would still work. However, you may be able to modify the query/game details to your liking in the manage options to make it work.