>> How about having a camera block where you specify the vertical FOV,
>> and the default horizontal FOV is automatically calculated to give
>> square pixels. But you can override it if you want.
>
>  How would you override the default pixel aspect ratio if so needed?

By setting the horizontal FOV manually inside the camera block.  As I said, 
the default would be whatever angle is needed to make square pixels (so the 
majority of the time you wouldn't use it), but it is there if you want to 
set it yourself.

>  Perhaps there could be an aspect ratio command-line parameter similar
> to the one in mplayer.

Yes, that would also work.

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