In a way I can see a private pasture being a good thing but at the same time I can also see it leading to something that could possibly be bad. If one person notices that someone has a private pasture I would be afraid EVERYONE would want one. I, myself, would not be willing to section off my entire land to appease everyone who felt they needed their own private run/land/shelter (minus their own stalls that is given). On the other hand, I would be willing to have a piece of land set aside for people who would want private pasturing be it for their own reasonings or they have a problem horse and once that land is filled that would be that and if they don't like it they can find else where to go. Not to mention I think it would look a wee bit ridiculous having loafing sheds running rampant on the land haha.