[General Questions and Answers] willfck4beer:
While I can't contribute to the question exactly - I found a resolution to one problem mentioned earlier which also has the benefit of enhancing the image quality dramatically.

To address the doubled image (ghosting, multipath, due to reflection at first windshield/air boundary and second windshield/air boundary) this can easily be solved with a mirrored thin film screen protector ... such as the .88cents ipad mini "mirror" screen protector on ebay. 7" seems to work great with the 5.5" super amoled galaxy note 2... I'm sure there are others out there that might be smaller or bigger depending on your device, the distance from dash to windshield, your specific range of motion in seat, and the like. One note with the ipad one is that there are two cutout portions that are a bit annoying... and the ipad size is not big enough to accomodate the note 2 in portrait and landscape.

GPS HUD in market as well as others have mirror mode and so this works until we can get Cyanogenmod to incorporate the feature. On Netflix/Hulu/Hbogo/Youtube (solely for your passengers of course) the mirroring doesn't much matter unless you need to read subs. Works great for movie.

The mirror screen protector (at maybe what - just guessing about 40% transmissivity???) Completely removes the ghost image/multipath so brightness is doubled and the reflectivity vs the windshield is substantially better too so the image is crystal clear... especially with AMOLED brightness to full. It even works during the day just fine.

I'm begging a smarter man/woman than me to find a way to implement this as part of Cyanogenmod or anything as being able to use Google Navigate will be SOOOO much better and safer. No reliance on suction cup, no physical mounting structure obstructing view, no possibility of structure failing at most murphy-inopportune time, no possibility of device falling from mount... and **** this is sexy as hell and geek as ****.

Grab the HP bluetooth expresscard mouse (it's smaller than the size of a credit card literally) and yet has five buttons, a scroll function, a fricking LASERBEAM and is only $8 on ebay with free shipping!!!! (you also may want to get a 54mm expresscard to usb adapter $2 free shipping - Kyocera makes a nice one) and you've got instant (though infuriatingly reversed) remote control that works on your pants-leg or center console to control the now slightly-less accessible device. Two other great remote control options are the Sony Liveview ($20) which also has a 176x176 amoled screen and four way touch function; or the motoactv with even higher res and a full touchscreen (vnc?)!!!

To reduce clutter - try the retractable micro usb 2.1amp charger.

To obviate the headphone to aux cable - consider the Samsung HS3000 - AWESOME!!! Believe it supports APT-X profile which some have reported to be leaps and bounds better than A2DP.

Lastly, velcro is your friend! A strip of male on the back of the phone or case and a strip of female on the dash board and over the radio face gives you two potential mounting points.

NOW - here's an alternate solution that will work but requires a bit of junk: Either an external display with hardware mirroring option (but don't think there's an amoled one out yet - so black and contrast will be meh) OR a pico projector via mhl/micro hdmi with hardware mirroring on (this is provided in case you wanted to rear project - all picos have this IIRC). The Optoma pk201 $189 is my favorite (854*480 resolution w/ HDMI and 50ish lumens)... the idea is to flush mount this on dash with a small 1"x1" 45degreeish mirror attachment (they have them on ebay for $1 or be creative to reflect up to windshield - if two reflections e.g. mirror then windshield, no need to mirror/flip/invert). This arrangement coupled with your phone velcroed to dash gives you ready access to touch screen in correct orientation and only the external pico/display is mirrored/inverted/flipped... best of both worlds.

***PLEASE BE CAREFUL***

in your driveway with keys out of ignition, parking brake enabled is the best place to experiment with placement... DO NOT DRINK, DRIVE, and WATCH pr0n :)

also... I don't know the legality of this approach