Pitch / Tempo control to keep time.
Pitch / tempo (maybe as a slider) controls added to each player. This would not only help give that "live" DJ feel (especially if used on roadshows) but also can help with keeping to time. eg. you need to shave off precious seconds of overrun or underrun time before the TOH, altering speed on any track(s) by a small percentage could be enough to keep to time.