The editor clearly needs an overhaul but also needs to be 100% compliant with current way posts are made/edited/displayed. That might mean a more spartan like editor (for bitcointalk at least). We'll cross that bridge when we get there.
The display part needs to use the exact same bbcode-to-HTML process and same CSS for legacy/migrated posts. Using stuff like "pre-wrap" will not work.
A new fancy editor can be used for new posts. Trying to edit old posts could come with a grave warning that it's a one-way conversion from old bbcode to the new whatever (Markdown/bbcode/HTML hybrid apparently is the target judging by the readme).
Perhaps users can be given a choice to use a plain textbox to alter old bbcode if there is a need but I don't think it has to force everyone into a spartan mode.
A few more things:
Thread list in a board can't be sorted.
Attempting to edit a thread title throws an exception in the backend.
Couldn't find a way to add users to ignore list directly.
Spelling error when entering a new trust rating ("Postive"). Seems to still use the old pre-flag trust format.
No merit system?
Scaling avatars down to little circles looks... uhm... horrible LOL. Text is unreadable. Might work for something like photos but that's not what we do here.
I figured out the image drag and drop. It turns out I can drag local files but not images from websites like imgur ("No images found").
An option to paste images directly from clipboard would be far more useful (for example screenshots).
Super Administrator is SUPER AD in threads. The excessive capitalization still irks me. Feels like it's shouting at me all the time. Waste of space too.
Couldn't find a way to move a single post to another thread or to split a thread (as a SUPER AD).
Can't report my own posts, which makes it impossible for e.g. a global mod to purge their own post but they can report and purge anyone else's posts.