Tvheadend

This might be a question for the XBMC forums, but how can I get a recording's thumbnail to appear when browsing my recordings in XBMC?
I'm pretty sure that when I was using MythTV as a backend, I would see a thumbnail (usually a frame from the recording) for each recorded show.

I would also see a collection of recordings of the same show as a folder in the XMBC recordings screen. Is it possible to do this with Tvheadend?

Thanks.