I have a little experience with setting up audio mixers for sound reinforcement and my experience is that even fairly simply mic'ed conferences and such do not benefit from merely "blending" output that listeners are expecting to come from various sides of the stage. You need to have what people see match what they hear or intellegiability is reduced...

The "magic" of even old fashioned Dolby LCRS channel sound had a great deal to do with Dolby sound engineers helping the audio designers to both record an adequate number of production tracks as well decide in post production how to "steer the mix" so that a convincingly surround experenice was achieved.

I suppose you might be able to play with an a slightly more complicated mixer setup that would allow you to alter phase and time delay but I suspect that you'd quickly make everything sound both over processed and potentially very noisy...