Hallo!
currently there's no low-priority messaging in Miller's pd version, but there is in the devel branch. It's one of the features that have been there for some time and i'm trying to provide a patch for Miller, so that it can make it into vanilla PD some time in the future. Hopefully the auto-discard mechanism of the patch tracker will blow up before that time. Don't expect the feature to be available soon.
hope that you get it in soon ... ;)
however, I tried to use this functionality af pd-devel for vanilla pd and used these features as an external, you can see some examples here: http://grh.mur.at/software/threadlib.html
LG Georg