Star Trek Cast Question

I know most of this year's Trek guests have attended con before, so I figured someone could answer this for me. Do they typically allow photos at their tables, or are you forced to go through that Froggy gentleman that people seem to have so much trouble with? Something tells me it would be the latter with Patrick Stewart, since he's relatively big-name. I've only just gotten into Next Gen about six months ago (late to the party, I know), so I have no prior dealings with cast members.