I think I can modify the existing combat event to allow for selection of a party member to participate in the combat. Then adjust the monster selection so enable creating a mirror copy of the party member as the opponent.
Allowing more monsters to show up in a battle would be good. I'm not sure of the best way to do it though. Most people will want to configure the conditions under which the extra monsters get added. A certain round, a certain monster death, or whatever. I'll add it to the list though and be thinking about it.
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CocoaSpud
Dungeon Craft Development Team
http://uaf.sourceforge.net