Echoing that same sentiment, I find that PM seems to work just fine, and to handle all sorts of topics including but not limited to P6, within a very simple, almost austere, number of categories.   If you simply say “Perl-6” somewhere in the topic, Super Search will find it.   Any Perl-related topic is fair game.   You don’t have to pick a particular box to put your topic in.   In effect, you “tag it,” just by what you put into the title or the message body.   And the whole thing seems (to me) to work remarkably well by its simplicity.