Some threads that may help:
http://forum.cubers.net/thread-4275.html
http://forum.cubers.net/thread-4230.html
http://forum.cubers.net/thread-1388.html
http://forum.cubers.net/thread-4275.html
http://forum.cubers.net/thread-4230.html
http://forum.cubers.net/thread-1388.html
Quote:Remember, even if your map doesn't fit quality requisites, you can still use /sendmap and co-op edit it (/coop mynewmap) on an upload-friendly server. Other game modes won't work until it is within the requirements.