Fair enough mate. I know you're a referee so you'll know the rules much better than any standard fan.
I still think that Evans staying down after the challenge contributed to him getting away with a card though.
100% agree with you about Evans.
Imo officials should be allowed to book players for simulating pain/injuries, not only for simulating contact with officials. If an official sees a player hit in one spot and goes down holding another (ex: getting elbowed in the chest and holding your face), or rolling around like they've been shot, the official should be allowed to yellow card the offending player. All cards given for this reason will be reviewed post-match by the nation's FA (at the top level, at least).
Now, this of course will he controversial. There can be injuries where the injury occurs away from where the contact is (example: getting your foot stomped can cause your knee to twist and bust it). But they leave so much up to the opinion of officials, whats so different with this? If you are overacting to get me to think a challenge was worse than it was, why can't I punish you? Just the rule being in the books would cut down on rolling about. These are pro footballers- if they can take less pain than the average 12 year old something's very wrong.
In addition, I would grant a one warning rule about surrounding the referee. If the referee orders you to back away, or gives a designated signal (such as waving you away with his arms, to overcome the language barrier) all players must back away from the referee immediately or face yellow cards. The referee will then call over the players he wishes to speak to, or the team's captain can request to approach (a simple "May I speak?"). If the captain can't approach (such as if he's been brought down in a tackle) one player, no more, may fulfill his place. This would cut down on players surrounding referees and influencing calls.