You are compounding your silliness, with all due respect.
Do you really think I could not take a player aside, tell him that when I touch my elbow to my knee I want you to [fill in the blank]? I can use signs to mean ANYTHING I want them to. Hand signals are WAY more flexible than speaking Spanish on the field. I can have one signal mean one thing in the odd numbered innings, and something totally different in the even numbered innings.
Watch a baseball game, will ya? The catcher uses different signs for the pitches when there is a runner on 2nd.
Are you suggesting the other side is completely ignorant of what those play signals mean? I suspect they pay a good deal of attention to them, if they would use steroids to win, they'd decode hand signals to win.