Ah appologies, I wasn't quite sure where to put this, either here or in the NFA sub forums.
In regards to the "adding friends to the trust" I'd never lend such a firearm to even my most trusted friends, too much crap could go on that could land me and him/her into a lot of hot water.
But I was under the impression that they simply couldn't use the rifle, period, if they were not under a "trust".
To me it seemed a little ridiculous that I wouldn't be able to let my buddy "joe/jane" fire a rifle that I have registered simply because his/her name was not written down on some paper.
So, as long as I'm present with the user I anyone can use the rifle so long as I have the paperwork proving it's a registered NFA firearm correct?