The guy who posted about /con pulling is not, in fact, clinically insane. This method does work sometimes, in some zones.
Nip over to Monkly Business, the guides forum, and check out the various guides on how to pull. Again, I repeat my standard mantra: the monks bust their asses researching and proving things. If they say it's true, it probably is.
Consensus over there seems to be that it works in some zones but not in others. Maybe the server refresh theory is correct, I don't know.
Regarding Bellow, the fact that you can use Bellow without stopping your song is huge. I use this all the time to position mezzed mobs, now that I'm using Morell, which doesn't have a push/pull component. Often on a two pull, I'll mez one mob down the hall a bit and bring the other into the camp.
Once group has the main target under control, I will start mez, let it proceed a ways, then bellow at the mob. Bellow breaks mez, mob charges at me, mez lands shortly thereafter and mob stops. If I judge the timing well, I can usually park the mob in a convenient spot for debuffing & fighting.