You can get the list of supported scorche3d options by running scorched3d with /? or --help on the command line.
The following are the current command line options for Scorched Earth 3D: -

Flag	Description
-allowexceptions	Allows any program exceptions to be thrown. On unix allows a core dump to be generated.
-loadmodfiles	Makes sure the client checks all files in a mod.
-loadsave [filename]	Starts a single player game by continuing a previously saved game.
-console	Runs the server in non-gui console only mode.
-screensaver	Runs the game in screensaver mode. Runs fullscreen, no sound and will terminate if on any key or mouse movement.
-connect [name]	Starts a NET/LAN client by connecting to NAME. e.g. -connect 127.0.0.1:27270
-password	The password required for locked online games during connection.
-starthelp	Runs the Scorched3D help browser.
-startserver [filename]	Starts a dedicated Scorched 3D Server. e.g. - startsercver data/server.xml
-startclient [filename]	Starts the single player version of Scorched3D. e.g. -startserver data/singleeasy.xml