Yes, Dave, I have. It looks as if it would do what I want if I only selected one item but it has limitations. If I selected more than one, it only copies one of the items (randomly selected) at each click placement. Another limitation is that it has to be a component and presumably doesn’t work on loose geometry. I can see how useful the extension is for populating a site plan with trees as in the demo.
BUT…it is clear that some of the functionality I want is built in, such as the ability to place a copy on each click without further keyboard input. So it may be that @ChrisFullmer might be able to produce either a dedicated extension or an adaptation of his existing one.
Yes, given the frustrations I had using AC, I am a bit surprised to find myself championing anything about it. But I guess, just as great artists steal from other artists, there’s nothing wrong with pinching good ideas!