I've been playing around with the Tweak Book function. It looks very nice
A bug, it seems:
Shortcuts not sticking (tested with Split function). I add a shortcut and press "Done", and the shortcut is shown. I press "OK", but the shortcut does not work. Upon returning to the Shortcut window, the shortcut is gone. If there was a different shortcut before customizing it, the previous shortcut is shown.
edit: The shortcut DOES stick, but it only works and shows up after restarting ebook-tweak.
There are some questions:
1. Is it possible to make the font in the preview window smaller? CTRL+Scroll, or CTRL-minus does not do anything, and I didn't see any options. The font is huge.
2. Is there a way to open the table of contents to use it for navigation?
3. What purpose does the inspector serve? It seems to provide a lot of information, but I can't think of a use for it for ebooks; it could be useful for a big website, but most ebooks seem to be too simple to need it.
4. If someone has the preview disabled, is there still another way to split a file? While it is a very intuitive way of splitting, I can imagine that there are people who'd like a Sigil-like "Split at cursor" option in one of the menu's to use in combination with code view.
And a suggestion:
Move the toolbar in the preview to the top, or make it a toolbar that can be displayed below the menu, next to the other ones. Personally, I always find toolbars on the bottom of windows weirdly placed, but this is a matter o taste of course.