Jay,
(Sorry so late for this reply. Im in Washington state and they changed
the remote phone number and I could not get the new one until today.)
Your proposal seems like a good addition to sense, but I am not convinced
that it is really needed for IPP. I still do not believe that the
combinations proposed by Tom will really be needed.
But I also believe that there may be other situations (other than IPP)
where the filtering may be useful.
Ron