Autoplay: are there any serious intentions to improve how this can be used? Example being able to toggle into autoplay mode whilst a track is already playing? (currently you have to stop playback before you can use it)
You can actually. Just select the other deck by clicking on the letter A or B near the [MIX] button.
Unless I've got it wrong, that unfortunately doesn't do it how I meant without disrupting the song that is currently being played

Scenerio:
Got a 4 minute song playing on deck A. I'm part way through but I need to step away from the laptop and I need to go now. I must keep the remainder of the deck A song playing as people are dancing.
I would like to be able to 'toggle/activate' Autoplay in a way that the current song can keep playing to the end (or its end-marker if that feature came!) and then the next track will load and play without me being there at the start of it.
The icing on the cake would be if there could be more controls how one track will transition to the next. Perhaps on a per-track basis (partially hence the end-marker idea). Crucial for myself is that each song is played in full (or maybe with an appropriate fade-out), then a very brief pause (e.g. one or two seconds depending on the songs) before the next song starts.