Yes adding in new random events for keyholder specific isn't that hard. There are currently 4 random events (currently 35% chance a day if there isn't another daily event already) and could easily change the chance or add more events into the pool. I was thinking I wanted some events where the player has to think about it a bit harder, as generally they are pretty easy to fulfil now with little drawback or risk.
As for genders that does need improving. I largely tried to keep it gender neutral but after coming back to it after a few days I realised the events don't work nearly as well with a female chase and male keyholder.
I like the idea of being made to serve the keyholder with a loss of all slaves obediance and some more gender specific stuff would be good.
There are a bunch of great ideas here that I would like to implement. Next time I get a chance to work on the mod again I'm going to come back and implement what I can from here. Most of the ideas I think will be fairly straight forward to implement. Hopefully I'll get some time soon this week.