How hard is it to add new jobs? I had this idea of a new house job/mechanic after I saw the 'assassinate' option in a girl's list.
After your fame reaches a certain level, the location of your home should be known right? So maybe you can set up a system where after a certain fame/infamy level is reached, there is an X % chance of a rival gang attacking your home directly. If they successfully raid, they could take items, girls, and money not stored in the bank. Maybe if the player has stats, also wound you to keep you from directing anything for a few weeks.
Having a gang in place reduces the chances of them successfully raiding your home, and girls with a high combat skill can be assigned as 'House Guard' to reduce those chances further.
If girls are taken, it is treated the same as they run away, and you have to send your gangs to get them back.