DVDAS is quite fussy about having exactly compliant streams for it's disc creation - and even streams that have the wrong "container" are re-rendered rather then being repacked to the right format.
However - there are presents that do not generally re-render when creating blurays. Try using the ones called (and I'm working on VMS10 here so they may be slightly different names) "Blu-ray 1440x1080-24p, 25 Mbps video stream" or "Blu-ray 1920x1080-24p, 25 Mbps video stream" (dependent on your original source material - there's no point moving to 1920 if your source is 1440). Obviously if you end file is too large to fit on the disk (23GB or thereabouts) DVDAS will try and re-render anyway. If that's the case you could render as sony AVC but again use the BluRay Video Stream templates as your basis and adjust for frame rate, progressive etc.
Note that these are only video streams so you'll have to render an audio stream as well as a wave (.WAV) file. If you call it the same name as video stream then the program will automatically pick it up. DVDAS won't use .ac3 files on BluRay disks (DVDA Pro will).
Btw - A lot of HD TVs do use square pixels (Mine has a native resolution of 1920 by 1080.) but they are usually very good at dealing with sources that are not their native resolution.
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