I was doing that already just without Dolby Pro Logic checked. It does sound a bit better now even, and that gave more control over which speakers are favored, nice! Thanks.
Yeah I just checked out the intro to LoTR: The Two Towers with those settings plus Dolby and it sounded pretty amazing. My speakers were only at half and it was INSANELY loud.
If the movie is 5.1 set it from the GUI. :P
It's not confusing, you will get used to it.