I would like to keep the redundant sd channels out of my guide but yet have the option to select the SD channel when recording a season pass or show in order to save space.
For example, I would record many of my kid's cartoons in SD instead of HD to save lots of space.
I might record a few of my shows in SD as well. 60 minutes? Not sure I need that one in HD. Same with Dateline or 48 hours. Lots of closeups of people's faces which is a camera shot that tends to look just fine in SD.
I might record the Australian Tennis tournament in SD as it takes up a ton of space even if I would prefer in HD.
And then some of the other shows the wife and kids watch I might record in SD as I know my wife doesn't care if she is watching in SD or HD and kids don't seem to care either.