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I'm not 100% certain (can't check right now) but could you not also do this using "Preview" in normal (single-frame) render settings?

Yes, it doesn't need to be rendered as a single frame movie clip, you just select the Preview renderer from the render settings, and check antialiasing there. Document render size is then controlled via the usual dialogue.

Adam :)

Adam Benton | www.kromekat.com