They should just have zero tolerance towards dissent and cheating. I think referees are as good now as ever as their full time and dedicate their life to the sport - its consistency thats required. It would be nice to see the FA publishing things and sharing stuff like referees meeting up, discussing games, aligning together to discuss the rules, discuss events etc rather than just seeing Howard Webb on sky once a month doing VAR.
ANY form of dissent, hand waving, sarcastic clapping etc is a yellow card. Do it again, even continuing in the same instance and you get a second and you're off.
Diving or simulation, waving imaginary yellow cards immediate yellow card. This is MEANT to happen but again we see it quite often and players waving to get a player booked and they only get booked themselves now and again.
It would start off with 10+ yellow cards in every game but they'll soon learn. You could have stricter rules in terms of build up of yellow cards aswell so at the minute its something like 5 yellows over 20 games and you get a ban, just change it to as soon as you get 5 you're banned for a game. Then next 5 you're banned for 2. Players will learn to behave and act appropriately.
Retrospective yellow cards should also be a thing so if a referee missed a gesture, missed a player walking off calling him a "f****** useless c***" then he can be found guilty afterwards and receive a yellow for that offence which counts towards his current total and towards any ban he may face.
I wouldn't go down the route of only the captain can approach the referee but i think respect is important. You can't be seen to make a foul or have a decision go against you and then blatantly clap, gesture or shout at an official.
Stricter referees is whats required not blue cards and sin bins. Clamp down harder, be consistent with it and it won't take long for players to curb their ways.