To add your custom mp maps to the mapslist goto the SWRC GAMEDATA then look for SYSTEM folder inside that look for ..
XMapList.INT if you are german it will be .DET french .FRT etc
There are 2 gameline types
Map=(FileName="DM_Canyon",LongName="Gunship",Screenshot="MapThumbnails.DM_Canyon",Text="Xmaps.GEO_CanyonSmall",IdealPlayerCountMin=4,IdealPlayerCountMax=8,GoalS core=30,TimeLimit=10,FragLimit=10,SupportedGames="DM,TD",bSplitScreenOK=1,bNetworkOK=1)
Map+=(FileName="CTF_ZeroG",LongName="Arena G9",Screenshot="MapThumbnails.KAM_ZeroG",Text="Xmaps.KAM_ZeroG",IdealPlayerCountMin=4,IdealPlayerCountMax=8,GoalS core=30,TimeLimit=10,FragLimit=10,SupportedGames="CTF,AS",bSplitScreenOK=1,bNetworkOK=1)
the filename of your map will depend on what gametype u make it . obvioulsy if you make a CTF map you can just copy it paste it eleswhere and rename it to add in for the different gametype.
CTF_MYMAP DM_MYMAP
Map=(FileName="DM_MYMAP",LongName="MY MAP",Screenshot="MapThumbnails.DM_Canyon",Text="Xmaps.GEO_CanyonSmall",IdealPlayerCountMin=4,IdealPlayerCountMax=8,GoalS core=30,TimeLimit=10,FragLimit=10,SupportedGames="DM,TD",bSplitScreenOK=1,bNetworkOK=1)
Map+=(FileName="CTF_MYMAP",LongName="MY MAP",Screenshot="MapThumbnails.KAM_ZeroG",Text="Xmaps.KAM_ZeroG",IdealPlayerCountMin=4,IdealPlayerCountMax=8,GoalS core=30,TimeLimit=10,FragLimit=10,SupportedGames="CTF,AS",bSplitScreenOK=1,bNetworkOK=1)
So just rename the FILENAME and the LONGNAME and copy paste it in to your xmapslist ..