i'm not sure i agree lud, it's really easy to see changes in the music structure in the current waveform.
not sure what all this extra mapping you're trying to do is exactly, but if you really need additional visual reference to a certain point in a track them just cue up that point in the track and hit the 'memory' button to set a marker. you can do this straight from the deck and this will give you both a visual marker on the waveform and a countdown to this point on the cdj display. it couldn't be easier!