Something I've thought about myself! I'll look into it soon.

And now, an oft-requested feature: the edit preview problems have been fixed. If you hit the back button (or "edit" link) by accident, or otherwise arrive at the edit page after visiting the edit preview page, you'll be presented with the option to restore the draft it saved when going to edit preview mode. This isn't multi-user safe or anything, but I figure it should be sufficient for now.

My next medium-sized implementation goal will probably either be exporting universes (for backups, etc.) or teaching the importer to reuse old ID numbers when wipe mode is enabled.