It is an uphill battle when I read through the ToS for the group to get a mass pull. Though it is not perfect, it was probably the best the devs could think of when comparing to the other MMO game WoW. After all, our lead guy does like the game too from what I hear.
It was a common thing said in their forums that some players interested in trying out tanking quit due to DPS pulling. Not a word was even attempted from some DPS with them running forward the second they zone in. Some have even tried to pull the whole entire dungeon with a fresh geared tank . . . Increased rewards wasn't enough since players reasoned they are here to have fun rather than take the blame for other players' mistakes. Since Shurrikhan suggested doing something similar with silently pulling, it may not go over very well. Especially since some of the players are Warcraft refugees like me who have went through really extreme cases with nonlinear dungeons. You know, all 3 DPS pulling from Narnia, Pluto and Andromeda and it was still somehow the tank's "fault" the AoEs and provokes aren't 1000 yalms. It just might end up getting you guys in trouble as a result to forcefully pull. If not that, then a longer queue as another possible outcome. I certainly wouldn't want a repeat of history for this.
Aside from the rant of experience of how agitated we can get, they have put in options for high end raids and trials to mark for practice and completion. Maybe a few buttons for "Safe Pulls" and "Mass Pulls" for the normal queue? Maybe not perfect either, but it's the best I got so far as a thought. I wouldn't mind some form of improvements for the Halls of Novice. I'll have to check out what it looks like to accurately say more.
In the meantime, I have decided that it is not worth it to push too much on a tank to mass pull. We pretty much have to make the slow tank say something like, "Only impatient DPS want it! My way!" before they might get the action instead. Not likely to happen since they just have to say single pulls are arguably safer. I may mention on fc how my signals were not noticed, but I won't force the tank.
I understand Expert Roulettes are only double pulls that are easy to do, but here we are. Tanks are very often in need throughout the roulettes. You might be able to convince them for a full FC group, but that would mean the tank is still effectively out of the PuG pool.