I was looking for the same functionality, and ok, I can live with record and remind with the option to cancel the recording. I've got plenty of space on my box if I miss the prompt, since it's not recording any suggestions... whole other story...
but here's the thing. I'm on my iPad and thought I know, I'll set a record and remind for my old TiVo upstairs to watch that new fake Dr thing on BBC. Then when I've done feeding cats, brushing pegs, I can wander up and if I'm idly filling time listening to some radio thing over the TiVo and don't notice the time, it'll flag up.
But I can't set to record and remind using the tv anywhere app, only record. So how do I make that happen, or something like it, if I'm not sitting in front of it when I remember to remind myself. Or am I missing something..
and btw the forum interface is truly rubbish if you want to ask more than a tweet)