IOW, the controls here are intended to provide users with full control over their own environment, while allowing others to use the same environment as they wish to.
Putting a limiter on a user violates both those precepts. Again, I fully intend on providing an 'ignore' control; this allows people to regain control over what they see, while allowing the ignored user to do as he wishes as well.
I will only restrict users when their actions have become, in my opinion, uncontrollably detrimental to the environment here.