That’s pretty definitive, so I must be mis-remembering, and had created test topics with the tracked tag present.
Oh no – I’m not suggesting that setting a user to ‘watch first post’ via tag should do anything retroactive.
But surely it’s common for posted topics to be tagged by staff later. I’d just somehow imagined that when a ‘watch first post’ tag is applied to an existing topic, it would generate a notification of that topic for users already WFP-ing the tag.
I’m still working with Askbot to come up with an ad-hoc script for these occasions…