It would be cool if there was a "Magic Driver" item that could attach to a mount in a house and trigger when a visitor mounts up. Instead of the visitor controlling the mount, the "Magic Driver" would follow a breadcrumb path and dismount when it got to the end. Maybe it would only be applicable to multi-rider mounts, where the visitor is automatically assigned as a "passenger".
It would be an interesting way to give a visitor a tour of the "estate" and an alternative to teleporting between closed-in areas.