Hi, welcome!
I agree that the plotscripting tutorial is far too basic. There's no indication of what to read next.
Well, this is a good next stop:
http://rpg.hamsterrepublic.com/ohrrpgce/Slices_Tutorial. Slices let you accomplish many things.
Cursed items currently aren't supported; you would have to script your own equip menu to prevent the player from unequipping the items. Hmmm... that would be a good idea for a plotscripting tutorial; you quite frequently need to create custom menus with a scripted component.
Just curious: what problems did you have to overcome by "trial and error"? Something that wasn't documented clearly?
Sephy made a first-person dungeon crawler tech demo ove seven years ago:
http://www.castleparadox.com/gamelist-display.php?game=633
These days it could be scripted much more easily bye using slices instead of tiles. Still, you're losing rather than gaining by using the OHR for this sort of game.