No "host" category for video/radio broadcasts
It's puzzling there is no "host" category for the names of hosts (or anchors) of radio and video broadcasts. There is for just about everything else - director, producer, guest, etc. Can one be created?
At my university it was decided (for items where the identification of the host was important) that the host's name should be appended to the program name (title):
"Talk of the Nation with Ray Suarez" or "Talk of the Nation with Juan Williams".
i.e.
host: Glass || Ira
It's very likely that Zotero will add host to appropriate item types (podcast, radio and TV podcast I'd assume) and once they do, they'll automatically migrate the information entered into Extra like that.
Edit: Note, though, that there is currently no citation style that actually uses the host variable, so as of now it's of limited use.