Default.cfg is located in the same place as your worms4mayhem.exe file. You can open it with notepad and add few command files.
Here are new ones :
There were previously unknown command lines, who can come in handy:
"/ AIMINGRINGS"
"/ AITEST"
"/ ALLAIPLAYERS"
"/ ALLOWSCREENSHOTS"
"/ ALTJUMP"
"/ AutoRun"
"/ AUTOSCREENSHOTS"
"/BUILDPS2SOUND"
"/BUNDLE"
"/ CACHEDATA"
"/ CLIFFSTOP"
"/ Config"
"/ DATABASE"
"/ DEBUGUPDATE"
"/ENABLEPORTFORWARDING"
"/ GAME"
"/ GAMEOVERMENU"
"/ GAMESEED"
"/ GAMETIMESTAMP"
"/ H"
"/HOST"
"/ HTTP"
"/ INVERTMOUSEFP"
"/ INVERTMOUSETP"
"/JOIN"
"/JUMP2"
"/KEY"
"/ LANDSEED"
"/LEVEL"
"/ LOG"
"/ LOGICSEED"
"/ MANUALCAMERA" - Tin! press the button "M" and fly it on the map =)
"/ MENU"
"/NAME"
"/NET_LOG"
"/NEW_CONTROL_BOX"
"/ NOATTRACT"
"/ NOCAMERALOAD"
"/ NODEBUGINFO"
"/ NODEBUGUPDATE"
"/ NOFRONTEND"
"/ NOHARDWARESOUND"
"/ NOHUD" - blank screen, no radar, timer and other crap =)
"/ NOMOVIES"
"/ NOMUSIC"
"/ NOOVERLAY"
"/NOSOUND"
"/ NOTELNET"
"/OLD"
"/ QUITAFTERBUILD"
"/REFRESH"
"/RUN"
"/ Script"
"/SELFTEST"
"/ SHOWDEBUGINFO"
"/ SHOWMENU"
"/ SHOWNETBANDWIDTH"
"/ SHOWOVERLAY"
"/ SHRINKHUD"
"/SHUTUP"
"/ SKIPMENU"
"/ StartMenu"
"/STARTUP"
"/ TELNET"
"/THEME"
"/ TIMEOFDAY"
"/TIMESCALE"
"/ TRIGGERSINVISIBLE"
"/ W"
"/WEATHER"
"/WIN"
"/ WIREFRAME" - a game with a grid, as well as on the screenshot above
Example, for hosting and joining the game, not tested, but judging by the loader PaulosCZ works:
hosttemplate=#EXEPATH# /HOST "/NAME:#PLAYERNAME#"
jointemplate=#EXEPATH# /JOIN "/NAME:#PLAYERNAME#" "/GAME:#ROOMNAME#"