Currently when moving or renaming a page, all existing links point to the old page. The correct behaviour would be to update all links to the new page, either optional or explicit.

Support for child navigation items to allow dropdowns in the main navigation pane. If you have a large wiki, it can be hard to organize your pages without some type of collapsible navigation.

Images should be pasteable via clipboard ctrl+V as a shortcut, similar to how Github's MD editor works. This would be a gigantic time saver.

Pre-fill path with current pages path as prefix. This will make it more intuitive to place pages correctly on first try.

Allow a page on the wiki to display which other pages on that wiki are linked to that page.

It would be cool to be able to view (i.e. render) old versions of a page in the same way as the recent one (without reverting to them or downloading the HTML as the latter looses formatting). This would be interesting in particular since major players in the wiki market (MediaWiki, Confluence) allow to do so.

Give the option to change favicon via administration

It would be good for the administrator to be able to select default date format and timezone for the entire site. Same way as the administrator is selecting the default theme.

To be able to open images that are inserted on the page in a popup/modal window or in a FancyBox/Lightbox. Also, to have varius types of galleries, sliders and slideshows for the images.

When a user created or edited a page, it wont publish right away, rather have a admin or higher lever user to approve the modification, then publish.