@newapollo wrote:
You can though search for something using voice (e.g. ‘Movies with John Wayne’) select the item you want, then press the contextual key (3 dots) on your 360 remote. This brings up a sub menu. Info and Add to Watch list. Highlight Add to Watch list and press OK.
Though you of course have to repeat that process every two weeks or so, for every search you want, rather than having it happen automatically.