Feature request : preview track on XDJ R1

I realise this isn't implemented but it could quite easily be done as a software upgrade.  I also realise that this has been brought up before but I just read a post that said it wasnt possible due to lack of buttons... Well, here is a solution that requires no buttons:

If one deck is locked from being loaded to (as its playing) and the other deck is paused then a preview of the track being selected via the rotary wheel could be played down the paused decks cue channel, similar to how the Rekordbox software previews the track by starting to play from around half way through when you mouse over.

This would be a killer feature and should be very easy to implement via software... You can already decode 2 mp3's and mix them independently via master out and via cue... If your internal mixer is a software mixer you could even stop this being output from the crossfader/slider outputs and limit it to headphones only.  If your decoded mp3's go straight to a hardware mixer then this is still possible... You would preview the track by playing it down the paused decks channel as would normally be the case and would be careful to have your fader/sliders off.

Anybody else think that this would be a killer feature upgrade? Can we have some love for this?