Hello again,
I noticed that when I have multiple factories selected (with the same queue in each) I can add stuff just fine, but when I try to remove things from the queue they're only removed from one factory. This is rather unhandy because, apart from the obvious "problem" that you have to cycle through all of your factories to change each queue, it also ensures the factories have different queues and thus won't allow you to easily manage them when grouped anymore.
I doubt that's working as intended, so I figured I'd post it.