I'd have fewer timers set up if I could specify multiple channels to record a show from. Example: Modern Marvels might have new episodes on the History Channel--or on H2HD.
Also, you should be asking these types of questions at the next pvr forum. You will get a more dedicated response for these type of operations. This forum is more for the front end side. There is limited recording options from the front end depending on your skin at the moment.
I really have no idea what I am talking about. Proceed with caution. I confuse easily. And drink. A lot.