Don't think this is a released Papyrus feature, yet. I've seen it mentioned several times here on HoFo.....and I wanted to go check it out as I also think this is a good to have option.
I downloaded their trial a few weeks ago, and then registered the software. LSS, this feature is not mentioned in the current online manual, which is back a couple of versions (from Nov 06) at 1.02.05. The current version of software is 1.02.08 (Jan 07). The online revision history does not list this option being added in between those updates. I also went through every setting in the 1.02.08 software today, in every menu. Could've missed something, but I don't think so.
So....to dig even further, I went looking on the Papyrus developer/user forums (sbsh.net). There was a post asking about this feature last Nov 06, but the response was that it wasn't implemented yet, but planned.
I still think the software is very comprehensive without this feature, but will be more powerful when they implement it.
FWIW.