+Priority 1 (highest)
Fix resolution of relative filenames in VOB lists.
Provide a means to specify video aspect and menu & audio language.
Suppress Mozilla error dialogs when processing (file not found etc).
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+Priority 2
+Use ffmpeg instead of mjpegtools to encode menus.
+Use ffmpeg to convert unsuitable video files (how do we check this?).
Add keyboard command for "top menu" in preview mode.
Add support for videos in preview mode.
-Support more than 99 videos by grouping them into titlesets.
+Support more than 99 videos somehow (grouping them into titlesets won't help)
Allow explicit ordering of videos.
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+Priority 3 (lowest)
May need to override default menu navigation actions because dvdauthor seems to cause rather undesirable behaviour when buttons are not arranged in a grid.
For any page with no links, add a "back" link (this raises the issue of localisation, of course).
If a page is too large, split it and add "next" and "previous" links (seems very difficult).