#1:There's a script request sub-forum. PM Falcon and ask him to move your topic there, okay?
#2:You probably are looking for a Caterpillar script. There should be one in the Script Database sub-forum.
#3:If you want only the characters in your party to show up for critical story moments, use conditional branches in the event controlling the story to change the party member events to the right graphics so the party members who show up are the only ones in your party, like FF7.