You can do this already. Check out "Advanced Passes":
Here's an example...
I have set up four Advanced Passes in priority order for new episodes of Jeopardy to control my preference order for station and time.
Priority 1: At 7:30pm not on a station I don't get good reception for.
Priority 2: At 7:00pm not on a station I don't get good reception for.
Priority 3: At any time not on a station I don't get good reception for.
Priority 4: On any station at any time.
There are many, many, many requests for this going back years. Be sure to search through the forums; there is a lot of good info already out there!