True, but talk about slowing the game down to a fucking crawl and MLB is only interested in speeding shit up. Can you imagine? Team A sees Team B just signaled batter to lay off, because Team A pitcher is about to throw a shit ball. Team A has to regroup which could mean a meeting at the mound. Meeting over, Team A sees Team B just signaled batter, a fast ball is coming. Team A has to regroup which could mean another meeting on the mound and or a bunch of other signals and so on and so on, vice versa and all that shit.
Fuck, just the suspicion alone would be nerve racking. Nah, if you're going to to do it, leave the higher technology out of it. That actually takes some imagination.