The solution is to use the system you use with runner on 2nd. Multiple sets of signs. Maybe you're doing first sign, second sign, third sign or last sign. The problem with doing this the whole game is the games take forever. If the pitcher shakes, the catcher has to do the sequence all over again. Then usually the batter steps out. Repeat several times an inning and you've got lots of frustrated pitchers and five hour games. Not good for anyone. And if there's a camera in CF, it takes significantly less time to figure out the "multiple sets of signs" system. And then you'd have to change the signs over and over. A runner on 2nd has lots to worry about (not getting picked off, what his 3rd base coach sign is, where the fielders are, when to run, etc.) and maybe one or two batters at most, plus he has to be clear on how he's relaying signs to the batter. With the aid of a simple app and a camera, you can nail the system within one batter. I really like what Matt Antonelli has to say about this.