Feature request for common watchlists, that can be maintained by users or bots. Logged-in users can subscribe to a particular common watchlist, so that changes to pages on the list appear directly on their personal watchlist.
Motivation and details on a possible implementation given at the url. It's a sort of enhancement of the extension PovWatch; the proposed implementation uses a UI similar to the AbuseFilter one.
Also solvable via T4308: Ability to watch lists of pages, e.g. all sub-pages of a page