(suggestion) non-square pixel flag

[nlolnlolnlolnlo]

it'd be nice to have an option alongside the "interlaced output" flag to automatically set the pixel aspect ratio of the output to be non-square. most ntsc video in the digital space is 720x480 displayed at a 4:3 aspect ratio, and as it stands it's a little bit annoying having to set that manually every time i render. could an option be added to flag the pixel aspect ratio on export?