I've got a question about shaping Plumies. I drive by one frequently that is about 8" tall and wide all the way down to the ground. Very full. Is this accomplished by Pinching/ pruning, or is it a natural dwarf? If manually shaped, how? I don't have a picture because there is no parking, and I would have to park a block away, but if needed, I can get one. I have read that they weight the limbs in Hawaii so they can harvest the flowers for leis, but this one is almost perfectly round.

It has a lot to do with the variety; some are more compact, some more lanky, some grow upright and others spread wide.
You can of course help it along a bit.

I'm aware that they each have their own personality, and unfortunately, mine are all reaching for sun, but I am just curious as how one would acquire this shape. If pruned, it would take lots of time and work, I would think, starting at a young age. This one is in full sun all day. I'm thinking about cutting my tallest, lankiest one down to about 1' just to see what I could do with it, but it helps hide my neighbors back porch from view.

I think you should get one of the more compact varieties that would suit your purpose. Here is my Plumeria obtusa 'Singapore' - you see it hugs the ground.

That's probably what the one I see is.