AIM - Give Aim Crosshair
FULLSCREEN - Start in fullscreen mode
WINDOW - Start in windowed mode
RESOLUTION - Specify the screen resolution to use (next param is )
FILERTL - used to load Userlevels (RTL files) (next parameter is RTL filename)
FILERTC - used to load Battlelevels (RTC files) (next parameter is RTC filename)
FILE - used to load Extern WAD files (next parameter is WAD filename)
NOJOYS - Disable check for joystick
NOMOUSE - Disable check for mouse
VER - Version number
MAPSTATS - Dump Map statistics to ERROR
TILESTATS - Dump Tile statistics to ERROR
MONO - Enable mono-monitor support
SCREENSHOTS- Clean screen capture for shots
PAUSE - Pauses startup screen information
ENABLEVR - Enable VR helmet input devices
NOECHO - Turn off sound reverb
DEMOEXIT - Exit program when demo is terminated
WARP - Warp to specific ROTT level (next parameter is level to start on)
TIMELIMIT - Play ROTT in time limit mode (next parameter is time in seconds)
MAXTIMELIMIT - Maximimum time to count down from (next parameter is time in seconds)
DOPEFISH - I think you know