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I'm not sure I would go so far as to have a second referee, but a second pair of eyes looking at the other side of the scrum from where the referee is would be useful.
I have suggested in the past that the referee should always be on the openside, and that the AR on the blindside should come onto the field as far as he needs to get a clear view. Once the ball is in, he scampers back to the sideline.
The important thing about the specialist scrum referee, though, is that he's specialist. Referees have a lot to think about all the time and a lot to learn. The scrum is very specialist, and let's be honest is very hard to understand - I don't mean that as a dig at referees, I am lost myself half the time watching a scrum. However, it is causing problems, and is an area of the game where it's logistically possible to bring on a specialist each time (due to the break in play). A former front rower, who knows the scrum in depth and can focus exclusively on learning about it and understanding it, will be a lot less easy to fool than a referee.
ALl this, of course, alongside basic rule and/or interpretation changes, such as angles of driving, and where the bind is.