Request: Protocol-specific shadowing

[superuser-does]

Problem

I tried shadowing a folder so it isn't synced over WebDAV but this also hides them from the Web UI.

Describe the idea / solution you'd like

To be able to shadow a folder only for the WebDAV server, but not the Web UI.

There is also the more general problem of not being able to hide a folder. We can hide subdirectories but not directories in themselves.
e.g. I can put h: on it, but it will appear in the Web UI but not in WebDAV. I can mount a volume to /var/empty but then it is blank everywhere.

Alternatives I've considered

I used the h: flag which worked as far as stopping sync, as did mounting to /var/empty, but they are all-or-nothing.

Additional context

I have a WebDAV mount. Because it is the mount of TiddlyWiki, which has a dual single-file and node.js setup, it means I have to store things in a specific root structure

tiddlywiki
├── assets/
├── package.json
├── plugins/
├── single-file-snapshots/
├── tiddlers/
├── tiddlywiki.info
└── mywiki.html

Of these, only mywiki.html and the assets folder are necessary to sync, though I sync my single-file-snapshots/ too. The tiddlers/ folders have lots of files as do plugins/, and are strictly for node-wiki's use.

The structure must be maintained exactly like this so the relative paths inside my single-file wiki work.