This is a really wonderful plugin! The inclusion of that editor is A+ effort and makes it so much more effective than others I've tried. I saw you're working on making versions of this for other menus, and I can't wait to see them after using this one.
I think the only thing I would love to have right now that I don't: a way to make the option which sets the number of columns to be the same as the number of actors in party also adjust the width of the actor window. I'm using the override window size options, so I would need a way to make it a static value that it adds/removes width by. My game mostly only has 2 party members, but you occasionally get a third, so I would love to be able to get rid of that extra unused space most of the time.