It would be interesting to look back at some of the most notorious incidents before the advent of Match Referees and try to imagine what punishment they would invoke today.
A few examples;
Colin Croft's physical assault on the umpire in New Zealand.
Michael Holding booting the stumps out of the ground when an appeal was rejected on the same tour.
The infamous Mike Gatting/Shakor Rana exchange.
The Chris Broad refusal to walk on the same tour.
John Snow shoving Sunil Gavaskar to the ground in England in 1971.
On the subject of referees I think some of the people appointed as referees are not suitable based on their own behaviour as players.
Chris Broad for example, as well as his behaviour in Pakistan he also marred the Bi-Centenary Test on the Australian leg of the tour by clobbering his stumps with the bat when he was clean bowled having made a century.
Clive Lloyd not only presided over the New Zealand tour he also showed great dissent in the 1975 World Cup Match against Pakistan when given out and when the West Indies won the match by one wicket after an unlikely last wicket stand he rushed on to the balcony and screamed "That will teach you, you cheats" at the Pakistanis.
If I was a player today I would be less than thrilled to be given a six match ban or hefty fine by either of these characters for the fairly trivial "crime" of a slow overrate.