Adding an Airport to the map could provide some new events to adjust girls' temperaments. A player might send a girl on a foreign tour to lower her temperament to more behaved; send her skydiving to raise it; purchase special events like a guest star activity for actresses or special tricks for girls in exchange for Candy Coins, and so on. I realise it's' a change to the game engine but perhaps it's a way to make the game more interesting and add some profit centres for the developers.
Also, I'm a web developer and I wonder if the developers would like some volunteer help with the English lang strings? I would be happy to look at a lang file and correct grammar and spelling if you would like.