I wish I could reset a recording to 'Not Watched'

Once a recording is Part Watched or Watched, there's no way back.
I'd like it if this status could be driven off the slider, so pulling it back to the start of the programme would set it Not Watched.
And likewise, you could set a programme to Watched by just pulling the slider to the end, or Part Watched by leaving it in between. You can currently set Watched by sliding to the end and then playing, but there's not much point to this.
And you can never make the status go 'backwards', which I would like to be able to do.
The scheme above has the advantage that it does not require any changes to the UI, just to what happens in a couple of circumstances.
I'd like it if this status could be driven off the slider, so pulling it back to the start of the programme would set it Not Watched.
And likewise, you could set a programme to Watched by just pulling the slider to the end, or Part Watched by leaving it in between. You can currently set Watched by sliding to the end and then playing, but there's not much point to this.
And you can never make the status go 'backwards', which I would like to be able to do.
The scheme above has the advantage that it does not require any changes to the UI, just to what happens in a couple of circumstances.
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I honestly can't think of a reason.
My wife falls asleep during the playback of recorded stuff (our YouView box is in the bedroom).
As I have to go to work the next day, I keep watching to the end, knowing that she can finish it the next day when I'm not there.
I should like to rewind the program to about five minutes before the first unmistakeable snore, and leave it there, 'Part Watched' for her to pick up on.
If you have a sufficiently inventive mind, you may infer the reasons for wanting a reset to 'Not Watched'.
Thanks for the explanation.