Got a PM asking if I ever found a solution. I did, and am back to share the workflow!
If you couldn't get full-size frames to export, here's one way to do it...
Video: How To Export Full-Size Frames with Animated Limited Region (43 MB)
This method works by skipping the Image Processing tab entirely and using Info Saver instead. A bit of housekeeping results, but it's nothing that can't be easily managed with some simple batch processing or a few clicks plus a renaming tool like Métamorphose.
I've since used this workflow in production here for speedy tweaks on client projects, and dozens of times on a point-and-click adventure game where the player can interact or change things in the environments and all possible states needed to be reflected in various videos.
Have fun!
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