I think you're on to something but I see an issue here. This would somehow need to be restricted to the person that bought the house, so that random people can't buy the extra access without the owner's permission. Otherwise, anyone that wants would be able to buy access to the house. Also, how would this work in terms of money withdrawal? If only the person that originally owns the house can add people to it, this means that /they/ would be the ones having to pay for additional rent costs. Otherwise they could add people and force them to lose money, even if they didn't want to be added.
Also, I think that coding for a rent split would not be feasible. After all, once a house is purchased the money is gone. If you add people after it is purchased, it would either need to have a set decreased amount for the /buyregion add
or it would have to be the exact same price as the original rent price. This means that, no matter what you do, the original cost of the house stays the same for the original purchaser (I don't think this can or should be changed).
Other thoughts:
-How will this affect the 2 house rule (1 house 1 shop)?
- Would this count as owning a house, preventing you from owning your own?
- Or would this allow you to own a house and share a house with someone?
-Shops are counted as rentregions, this could be used to add extra people to a shop slot. However, the largest issues with this are as I stated in my first paragraph.
Just some things to think about and discuss.