I did a little searching, but couldn't find a topic discussing permissions for items, though I'm sure it's been brought up before.
I'd be really interested to know why we don't have permissions for items. For example, if I want to set a cubimal out on my street, I can't because it would be stolen within a day. But if I had the ability to set the item options to only work for the owner, then I wouldn't have to worry about decorating with different items.
It just seems like common sense to me.