[Maxscript] Suppressing PShop dialog flag in shelllaunch

I’m shelllaunching PShop within Max, but it keeps getting a dialogue during initial launch that says “Skip loading optional and third-party plug-ins?” I don’t get this at home; only at work. Both are CS6 Extended. I assume there is some flag I can send that will suppress this, but I can’t seem to find a thread here or doc on-line.

Does anyone have a link to where I can find Pshops command flags?