I would love to see the ability to set a wishlist by episode number or season.
There are certain shows--take Alias for example--for which I've missed specific shows.
Alias airs on multiple channels so setting record all with duplicates will clog my TiVo; but I would love to set a wishlist for Alias episode 203 or Alias Season 3.
Of course, this would only work for shows that provide TiVo with episode information.
Just a thought.