-Disable scrollbars (not sure how how to do this).
-May need to override default menu navigation actions because dvdauthor
-seems to cause rather undesirable behaviour when buttons are not
-arranged in a grid.
+Provide a means to specify video aspect and menu & audio language.
+Search whole of history rather than just previous page when deciding whether a link goes back or forward.
+Set Mozilla's idea of the pixel aspect ratio to match video pixels. (For extra credit, scale preview mode to correct for the differing aspect ratio.)
+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.
+Avoid exceeding the maximum 128 instructions per PGC.
+Allow explicit ordering of videos.
+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).