I was thinking of offering some extra service to my readers,
giving them a choice which categories and/or tags to receive in their feed.
(with for example a page with checkboxes and a button: get feed)
But it seems that a function in WordPress is missing since 2.7:
It's not longer possible to use domain.tld/feed/?cat=1,2
The feature has been added 3 years ago.
Does anyone know if it's still possible?
And if, how? Did I miss a plugin which offers such a functionality, or is it still hidden somewhere in the core?