The last thing a ref wants, or needs, is a yappy TJ/AR. What they like is clear indications of infringements and assistance in areas they can't police, ingoal on the sides, late tackles on kickers, offside on the side the ref isn't, etc. I make a point of loudly marking 5 and 10m lines at scrums and lineouts, and call out when they're infringed. Most refs appreciate it, one thing they don't have to worry about. In fact, a strong case could be mounted for TJ/ARs to adjudicate on ALL offsides at the breakdown, al la soccer, as it's quite easy to get positioned on the offside line. I find players keep their distances carefully when they know another set of eyes are watching them encroach on the 5/10m/offside lines.