I think the suggestions about retrospective reviews of referees' decisions is a very good one, one of the great things about football is the way the game flows nearly non-stop (very different to watching Rugby which is, by definition, a more 'start-stop' game regardless of video technology being used) and this use of video technology would allow retrospective banning for simulation and possibly the use of bans for crowding the referee - although what would happen if the players crowded the ref as a result of a clearly incorrect decision would be an interesting point of debate - whilst preserving the 'flow' of the game we love. This is just an extension of the appeal rule already in place for red cards really but I think it would be well worth implementing.
A lesson to be learnt from rugby for me is to mike up the refs in such a way as to let the commentary team and the listeners/viewers hear what he's saying. It provides a unique perspective towards what is going on on the pitch in rugby and I think it would also be interesting to be able to hear the dialogue between the players and referee, which the rugby ref mike does pick up. Might go some way towards protecting the referees from abuse as well, because I sometimes get the feeling that referees let swearing at them go in order to keep the required number of players on the pitch for the match to continue!!
Another lesson to be learnt I think from rugby is to use the captain more as a point of contact for the team. Notice in rugby that very rarely will the referee engage in any serious dialogue with a player when not in the presence of the captain, and any team warnings go through the skipper. If this culture is bought into football then maybe in a decade or so's time then we might see a reduction in the crowding of referees that we see now. I watch quite a bit of rugby but I'm never entirely sure if this is an 'unwritten rule' or an actual formality but whatever it is it would be nice to see something like it in football.
In my view using video technology for offsides etc. during play is not a good idea as it would interrupt the game too much. From the sounds of the technology that is to be used for goal line decisions it is near as makes no difference instantaneous, whereas in my view the use of slower video review techniques (like for tries in rugby) for offsides is damaging to the game as it requires the game to be stopped completely in the middle of a passage of play. Just my view, and please do correct me if I'm wrong regarding the goal line technology.
At the end of the day any help towards referees we implement will not only help the game be more 'just' in terms of crucial decisions like goals being given and with retrospective punishment of simulation or referee abuse, but gradually in my view if we help make the referees in football more infallible with the help of technology then instances of simulation and referee abuse etc. etc. will decrease as players will hopefully begin to realise that they cannot beat the system in the same way they can now.
I know this may have gone slightly off topic from the OP but as you might have guessed I have reasonably strong views on the subject

. Thanks for reading if you made it to the end