i think this would work if like you could pay senior staff to enable road editing for a bit, then as long as you had teleporters you could build whatever over the course of a few hours (there would have to be a limit to make it a worthwhile rupee sink) like say 4 hours for 10k per road. they would just make the road a temporary subzone then when your time expired they would put it back. i think this would make both sides quite happy, i for one have paid for road changes multiple times and probly could of saved money if i was just given the time to do it myself without having to build models.
You first have to implement a system that detects if both residences are owned by a player/ip. Anyways, it is not world guard, it is custom. I would know, you used to be able to view plugins, not sure if it still works.