I do not know if a PAR = 2 works for typical Blu Ray player - do you have experience here, or how do you playback the footage?
Wolfgang- My experience here is using wmv codecs and I've been experimenting with SBS Full at 2.0 PAR as well as other unique settings. While the pull down menus have both 1.0 and 1.33 PAR selections, in this case you can ( I discovered) type in your own PAR and 2.0 works ( meaning no unknown render error) I then display using a direct computer to passive monitor or via my LAN to a Popcorn Hour A-210 box that connects to my Sony Projector 90ES.
I've been doing a lot of experimenting with extremely wide IA using twin Sony HDR TD-10's The TD-10's are in 2D mode and carefully calibrated using the camera optics and measured targets. The goal here is to produce a letter boxed panorama in 3D of long distance scenery, such as mountain ranges, canyons and city skylines. I also want to play with fireworks where the fireworks fills the room with negative parallax. The latter would not be an extremely wide letterboxed display but rather a normal 16x9 since scene height is equally important to scene width. Anyway, I'm making great progress with this experiment and the quality is quite impressive. Using SBS full is necessary due to the display restrictions I'm working with right now. If I get everything worked out in the other parts of the panorama 3D project, I'll begin working on how to render to a BluRay with present tools but for now, SBS Full on wmv seems to be working for my internal needs.