Its not rocket science. If you cannot remember about 5-10 signals , are you really smart enough to be playing? You make it easy to remember using mnemonics. Are you really trusting a teenage girl not to lose one too?
Swipe chest =steal
heart = hit
ball fist = bunt
Two fingers across chest = double steal
Scratch head = Sacrifice
Tap bill of cap = take pitch
etc. easy as pie to remember Just made up examples,