We used to call pitches from the dugout using a finger system (like catchers use) from the dugout. If the coach gave a "thumb" it meant to pick to 1st. One of the best things I've seen implemented is when you know a guy is going to run, or has an unusually big lead, we put in a "pause...........then pick". What that means is the pitcher comes set, counts to 4 or 5-one thousand, then gives his quickest move. The runner is on edge, anticipating, waiting for the guy to go home. He has trouble staying properly focused and relaxed for 4-5 seconds. We would signal this by giving the Pinky "P for pause" then the thumb, then the catcher would give the exact same sign to the pitcher. I can't tell how many times this worked for us at the 14, 16, and college levels. Pause...............then pick.