You can use Command+click to move a window without it popping to the front. But you can also do much more with Command+click that will act on a window in different ways. It conflicts with Safari's Command+click functionality and it is hard to do some things because the window isn't the frontmost one, but there is potential there.
Note: This is Club MacMost exclusive content. To view this video click the thumbnail below to go to the post as Patreon.com. Once there you will be able to view the video as long as you are logged into your Patreon account and a current supporter of MacMost at the "Club MacMost" or higher level.