Probably prepare the tirade they will deliver to their drivers after the match: "What were you doing, you idiot! Not only did you slam a massive ball into my station, but you also did the same with a robot! At 15ft/s! You moron, you..."
Serious time: I can't think of much. If they have a reliable connection to the robot, they could send signals to it that light up LEDs on the OI to inform drivers of situations that they can't see.
As for advantages for remote versus local coaches, I can't really say. It all depends on you hybrid strategy.