It looks like AM is only able to configure one folder location for VST plugins. Do I have that correct?
by what I know yes, you are correct
It would be helpful if people could explain why they need more than one VST folder. That would help me design the correct solution.
I'll speak for me but sometimes there are some plugins that I don't use in anything else other than audiomulch. Kind of like a bunch a vst plugins that I use in modular way only so they are kind of redundant in other hosts.