Difficult to answer, since I read from your profile you are a professional ATC. You could take a look at http://www.vatsim.net/
. This is a worldwide network of people who control Flight Simulator traffic so to speak. You can be a controller there, but doubt if you get thrilled by controlling non-professionals.
About a stand alone simulator, I've had a simple one a while ago, but I forget the name of it. Wasn't that good too and think you wouldn't be enthusiastic about it as well...
I can't help you on anything more, sorry...