These new permissions for carts could be improved. On my deed we have always shared large carts but with the new permission system if I use a cart that I didn't build and walk away from it when it's on another deed I lose it despite having been given permissions by the person who built it. I think if a person has command permissions on a cart they should be able to command it regardless of deed permissions. What reason is there for my not being able to command my friends cart just because I am on another deed?
If there is a good reason for this setting maybe there could be a warning message. I lost a cart, two horses, and several loaded items this morning because I was in what looked like a wilderness area but was actually a deed. A simple warning message would have saved me a lot of grief.
Also I think citizens of a deed should be able to command a cart they don't have command permissions for just until it leaves the deed. They shouldn't be able to open it without permissions, or continue to drive it once it is off deed, but that would allow an abandoned cart to easily be removed from a deed.