So why not one of the Nobody-Patches!
Since it's late and I'm tired, I'll just quote the readme.
PATCH README wrote:When hosting custom gametypes, there is usually the problem that it's not possible to start a server
with the custom game type over the host screen because the host screen just supports the default game types.
Since DXMTL was invented, adding custom game types to the selection is not possible anymore at all.
THIS PATCH
..patches DXMTL152b1.u to enable the loading of available game types from the config file.
For detailed usage instructions, I recommend to read the readme nevertheless!
That's all so far. Have fun!