Hello !

I found these additional command line switches for Heretic:
(values in brackets are necessary integer-parameters)

-nomonster 
---> play the game without any enemy

-warp [EpisodeNumber] [LevelNumber]
---> starts game at EpisodeNumber, LevelNumber
     For the shareware-version only EpisodeNumber=1 is valid

-skill [SkillValue]
---> start game with Skill=SkillValue

-episode [EpisodeNumber]
---> same as first part from -warp

-loadgame [GameNumber]
---> starts game from file with number=GameNumber in
     its name

-devparm
---> ??? (purpose unknown)

-respawn
---> ??? (purpose unknown)

-ravpic
---> make a screenshot with F1

-debug
---> ??? (purpose unknown)

I hope this is useful

Stefan