Source of media files
Move images and other media files which have to be loaded by URL to the cloud so the URLs don't have to be fiddled with as the site is copied around
Posts by Louisa
Category vs Tag
Each post has only one Category. It can have various tags
Post with a gallery
The gallery shortcode is eminently copyable because it doesn't include urls.
Force strong passwords
I'm surprised this isn't part of WP core. There are a few plugins which address the problem, at least one of which admits to being susceptible to being bypassed by a knowledgeable hacker. It ought to be possible to see how strong a user's password is from the dashboard.
Presentation slide page style
Something between a page and a series of posts. Initial experiments quite promising, but requiring a child theme for each theme used is not a good thing.