Got a reply from the admins through the ticket as follows,
both maps of a cluster server have to be custom launch command lines, so that explains it better for me now.
Just passing it along...
thx for your reply, the problem i am having is when I put the custom map command line in the field box, it tells me the command line is either too short or exceeds 2018 characters.
Here is what I put in it:
CrystalIsles?Multihome=xx.xx.xxx.xx?Port=xxxxx?QueryPort=xxxxx?SessionName=xxxxxxxxxxxxxxxxxxxxxx?MaxPlayers=xx?listen?ServerPassword=xxxxxxxxxxxx?ServerAdminPassword=xxxxxxxxxxx?RCONEnabled=True?RCONPort=xxxxx?AltSaveDirectoryName=xxxxxxxxxxxxxxxxxxxxx?MapModID=804312798?GameModIDS=xxxxxxxxxxx,xxxxxxxxxxxx,etc
I'm probably going put in a ticket and ask SS