I don’t currently see this ability, and I don’t see it in the feature requests area, so I hope this isn’t a redundant request.
It would be nice to enter a search in Tablo and if the search returns nothing, have it sit in the background waiting for the search parameters to be met whenever the guide is refreshed, then let the user know it’s available to record. For instance, if there’s a certain movie I would like to see, enter the title and have Tablo always be looking for it. Also include other parameters like actor, etc.