Problem: Notifications are currently driven by user-based actions: reverts of the notified user's edits, thanks, mentions and replytos or pings. If an editor wants/needs to work on one thing yet keep an eye on a particular article or set of articles (or pages), this has to be done by regularly checking a watchlist or the history pages in question.
Proposed solution: Notifications could be triggered by edits to pages on the user's watchlist, perhaps even keyed to edits that resemble apparent vandalism situations, or edit wars, where the user being notified might want to be able to respond more swiftly.
Who would benefit: Admins and vandal fighters, but I think everybody.
More comments: Yes, this could make some user disputes a little hotter. But I think it would be a net benefit to the community and the project.
