If you are going to do like you asked in the other thread...and double up on the acoustic and then pan hard...I would record each track with a single mic, just find the best position that you can...or record one track with one position and the other with a different position. I've done that or used different acoutic guitars for each track.
I think doing two tracks, each with two mics, and then split/panning...it's gonna sound washy, especially with the busy mix.
Actually, if I was in this situation...I would drop a pickup into the acoustic and record that way. I use Dean Markley ProMags for that. It will give you a more focused sound...though granted, with a touch of electric flavor, but it still has the acoustic vibe. In a busy mix, I don't want doubled acoustic tracks that have a HUGE/WIDE sound...so using
a ProMag tightens that up and allows the two track to slot into a specific space rather than washing it out...likewise, so will a single mic, fairly close to the guitar.
For a sparse mix...HUGE/WIDE acoustic guitars will sound better, and you will appreciate all that extra bandwidth in that kind of mix, so by all means, use more than one mic and go for the room sound too.
Just my $0.02...