This is a request from QMS Demo with Alamo SS who has two locations on SiteLink.
They run on an anniversary payment scheme and when renting an additional unit to an existing tenant, SiteLink offers them the option to assign the same PTD as the tenants existing unit, or assign the PTD one month from move in date. They have many tenants with multiple units who want rent due on the same day. I imagine ther will be many other SL users who will want the same ability.