There is a bug with CS6, ran into it last week. Where some of the presets for exporting disappeared with a certain version of CS6.
The Fix:
Do an update of the adobe software, presets come back.
You should choose export from APP and send it to Queue. This will launch AME, there you can compress.
If you shot HD 16×9 and edited HD 16×9, then your SD DVD should be 16×9. This will fill the screen when viewing on a widescreen TV set, even playing off DVD. Yes, it will be letterbox for the 1/2 dozen or so folks left that still have a 4×3 tv set. But you will not loose and quality, where as zooming in to fill screen will.
Chris