Unless gemini made a change they still sell the device with the Win/Mac version of Cross.
If you want to use Cross DJ app (android) then you have the following restictions.
From the website fo Cross DJ app:
Connect your Android device to the U-Mix Control-Pro, the Pioneer DDJ-WeGO2 and the Pioneer DDJ-SB: all Cross DJ controls are mapped. Browse, scratch, sync tracks, add effects… everything works at a very low latency. Watch the video: http://youtu.be/5ocke5GDg78
MIDI Control for devices running Android M: On those devices, MIDI control in Cross DJ is now Plug & Play.
Pre-cue your tracks
Pre-listen the next track in your headphone and prepare your transition. All you need to do is to plug your audio split cable and turn on Split mono mode. To pre-listen the next track, go to the EQs tab and press the button to pre-cue your tracks. Works also with external mixer: control EQs and crossfader with hardware mixers. Watch video here.
Multichannel audio for devices running Android M: For devices running Android M, the app provides dual-stereo output. Users now can pre-cue in stereo, while having a stereo master output at the same time.
You would need the Pro version of the app to have MIDI support at all.
It might be you used other channels to get support, but if not it would be hard to provide any support while your post has been replied to.
If you've new info or more details don't hesitate to ask. As answers are given to best knowledge of fellow users (also moderators are only users like you) it maybe there is more to it. AS far as I can see it you come back after a while and because you haven't seen the answer you want you call it lack of support. Be sure that if I or anyone else provides a wrong answer there will always be others to correct this.
So don't hesitate if you have more to add to get it to work. On the other side, if someone gets something to work in a non supported manner, it will not be provided as a solution to others. There are over 1000 ('active') versions of Android around which makes it big enough a challenge for the devtem to make and keep all running.