This shouldn't be a problem because the Cue methode of the
CDJ-800MK2 is the same as for the
CDJ-800:
Hold the track (by pressing Play/Pause or touch the Jog Wheel) and press Cue.
The CDJ will set the current point as Cue Point, marking it red in in the Jog Display. It doesn't make a difference if you press it short or longer. It should work the same for audio CD and an MP3 track. Why do you use VBR ??
Disc space is not an issue anymore when playing MP3 so why not just use CBR at th highest bitrate ? This gives the best audio result ?