There is an Episode number field in the data, but I haven't seen it filled in for some time now. If it was used, and consistently correct, then that data could be used in an advanced wishlist in a hypothetical software update. But as things stands the data just isn't there, and given the problems with the "first run" feature which only uses one normally-correct piece of data, I'm glad they didn't try!
Only wanting one season of a programme is pretty niche; I can't remember anyone else asking for it before
. Given that the actor method may not always work, another method is to create an Advanced wishlist which lists the episode titles of each episode in the series. You'll have to sit there entering 20-odd strings, but it should work well.
Wrong, see above!
I use a variation of that myself actually. I don't just want one season of something but I do want everything from season 4 onwards. The channels keep repeating seasons 1-3 because they're too tight to pay for anything later. I've got an Advanced Wishlist for the first episode title in season 4. If it ever gets a match and I find it being broadcast, I will then be able to create a Season Pass for it. You could do that and just use the Season Pass for, er, 1 Season.