First, you’re in the wrong forum.
The correct forum for the WDTV Live SMP you have is here: http://community.wdc.com/t5/WD-TV-Live-Streaming-Media/ct-p/wdtvlive_streaming
You’ll need to change the profile for the device on the Sling website to use the correct remote.
I have a Non-DirecTV Tivo (a Premiere Elite) and the DVR button is correctly mapped.
And, no, the WDTV doesn’t retransmit remote commands.
