I have some severs I manage VIA Remote Desktop. They do not listen on port 3389. I can connect with out issue doing IP:PORT.
I now manage so many I'm trying to use the Remote Desktop snap-in for the management console. But it will not let you enter a colon in the host name.
Is there another way to specify the port?
Here is link to the snap-in.
EDIT:
I'm using XP... yeah I know I'm behind.
You can't do it with the snap-in, but as others have suggested you can use a third party program to do it. I use RoyalTS myself.
Not sure if it is an option for you but it allows ports in the windows 7 adminpak Link
I dont know whether you wan to stick to the standard mmc, you might find useful Terminals, which will allow you to connect to many servers and save the configuration.
http://terminals.codeplex.com/