Maybe use hand signals to get an edge on a tie-breaker, but all match long! Sounds like it would slow it down too much and there's already too many slow players.
No way, jose. Good doubles is about communication. I coach girls tennis and if I don't see my doubles players get together and talk AT LEAST once a game, I make them run laps. You need to talk about what you're doing and planning. Doubles isn't just two singles players, it's about acting like a single organism that moves and poaches with one mind.