NWScript:

int secret_crypt_party_flag=0;

void main()

{

  int difficulty = 20;

  object oPlayer = GetNearestCreature(CREATURE_TYPE_PLAYER_CHAR,

    PLAYER_CHAR_IS _PC,OBJECT_SELF,1);

  int search_score = GetSkillRank(SKILL_SEARCH, oPlayer);

  if ( (d20(1)+search_score > 20)||GetLocalInt(GetModule(),"secret_crypt_party_flag") )

  {

     SetMapPinEnabled(GetObjectByTag("NW_SD_CRYPT",0),1);

     SetLocalInt(GetModule(),"secret_crypt_party_flag",1);

     ActionStartConversation(oPlayer,"crypt_sd",TRUE);

  }

}

1) the 'difficulty' is the DC for a search/spot (I just picked 'search').
2) the oPlayer is the closest creature (ie. the creature that walked into the Generic Trigger floor area)
3) search_score is the 'search roll'
4) the 'secret_crypt_party_flag' is used to 'spread the knowledge' to the other members of the party so they no longer have to search to find it.
5) The SetMapPin turns on the MapPin for a Waypoint I stuck on the secret door Generic Trigger Area. The ActionStartConversation calls a 'take secret door?' conversation called "crypt_sd" and keeps it Private (ie. TRUE...only the player who found the secret door has the conversation). Only 2 choices in the conversation: 1. take it 2. dont take it. In theory, you could add a 'notify party' option if you want to set the global flag to let everyone share the wealth.

If the player takes the secret door in the conversation, the following script is called:

NWScript:

void main()

{

  object oPlayer = GetPCSpeaker();

  object oTargetArea = GetObjectByTag("NW_CRYPT_START",0);

  AssignCommand(oPlayer,ActionJumpToLocation(GetLocation(oTargetArea)));

}

this results in the teleporting of the speaking character to a Waypoint in my Crypt Area called NW_CRYPT_START.
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This seems to satisfy a few requests for a generic secret door method (Area transition waypoints create an arch on the cursor, Trap transition areas wind up saying 'Trap Triggered' over the players head who walks near the secret door :/ ).
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Hope this proves useful for someone...great learning experience for me ;P