At any rate, the functionality of OOZFILTER is hardcoded, but you can still add the flag to the sprites in GAME.CON (or in any other CON for that matter).

I would try doing it like this:

CODEgamevar temp 0 0

state nolight
  getactor[THISACTOR].htflags temp
  orvar temp 256
  setactor[THISACTOR].htflags temp
ends


onevent EVENT_LOADACTOR

ifactor OOZFILTER state nolight

endevent

You could add that block of code to the top of GAME.CON, or to the bottom of GAME.CON

For every tile that you want to prevent from emitting light, just add a corresponding line such as "ifactor DIPSWITCH state nolight" to the event. Notice that the code uses orvar to add the flag for no light, so as not to erase any flags the sprite may already have. This method will only work for sprites that are in the map. It will not work on sprites that get spawned, such as respawns, projectiles, etc.
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