IMHO, it's much easier to do this standing on the dance floor with a wireless mic than from behind the DJ booth, and also helps "body language". The times I've done this, my son has been back at the laptop - I've never tried it solo even though Mixvibes offers an iPhone remote control app for Cross DJ. I'd sure love another button on the mic labeled "Push to Play/Pause"!!!
I remember thinking of something similar.
A remote (wireless) play/pause/next button that is either built into the wireless mic
or it is a "ring" that can be placed over it.