Unfortunately, there is no way to implement this in the game as far as I know. A real pity - I would like to use this in my ongoing 1001 Nights mod project...
Another thing - I won't be able to play for about 2 weeks starting next Tuesday: I'm being send off for a field work, where I won't have a gaming computer (though I'll probably manage to appear on forum from time to time). But I think I can find a sub before that...