Pogre,
Even a single person sitting directly in front of the screen benefits from "at least" an alternative "useful" speaker configuration and experience. The setup/design in my OP allows you to alternate and enjoy your speakers in various ways. Also, by alternating through the various "useful" configurations afforded to you via this setup/design, one maybe realizes, enjoys, distinguishes and appreciates the benefits of each configuration "refreshed" by not getting stuck in any one particular listening experience "ghetto").