I have heard that CBM is particularly popular with the IRC Blitzers so I will probably keep those games running. So far Im not sure if there are others using those so if the IRC group agrees on a change of settings that shouldnt be a problem.
The problem with pre-made maps is that there either needs to be an agreement (is there a default CBM Duellists Map on IRC?), or it would take a webpage like this one that I created long long ago.
http://www.dom3minions.com/lab/MakeGame.htm
But for various reasons, having users design and start games that run continually is not a good idea.
Some of the trusted users on the server have created such make-game pages for their own use which isnt too bad but Im probably not going to open up a public one.
Of course this is for the mass-created games. When people request that I host a special game then there are no limits. Any mod, any map, any settings, added designed AIs are popular, it can be direct-connect or pbem or both. Wide open. I like it when someone challenges me with an idea they want for a different game than usual. At the moment I have 4 of those running.