If you set up a Dish-pass timer instead of a search, then you can limit to a specific channel, newness, and/or HD or SD. There is a limit of 96 timers, several hundred events on all timers, and say the latest 36 searches. My two 722s are near the limit on timers and searches all the time with no overlap. Some films just come up so seldom but I would hate to miss them. But remember to remove the pass when you get the result so you can add the next one.
-Ken