I don’t think there’s a problem this will solve, because the issue is that the other flags are doing too much, not that Something Else needs to do even less.
Creating tiers of alerts and then conveying this to all members (not just Regulars, and many of whom are using online translation or have limited English) adds another layer of time-consuming work for Discourse moderators, many of whom, like me, balance volunteer modding with busy lives, and also another change for users to adapt to, with no clear benefit.
For example I would have to edit a huge load of posts made where I and others have explained how flags work over a lengthy period, posts which could still be found by a new user searching for help, and even after I’ve done all that, there remains the danger of a user who’s not aware of the change doing something wrong, being embarassed when this is explained, and then deterred from future engagement with flags.
(I’ve been trying to refrain from saying “if it ain’t broke, don’t fix it” all day but I kind of have to say it here.)
Also, I do not always rush to click a new PM notification if I’m doing other things in different tabs (like paid work unconnected to the forum, or answering on a topic, relevant to the subject discussed) but will always attend at once to a red flag icon.
My actual dream scenario would be for TL3 to have an additional flag option on the menu, which IS configured to hide a post with a single click, and which sends a notification PM to Staff (and consequential email, if not logged in) saying something like “Rule violation: I have hidden this post pending Staff review” with a field to add any other info, and then each forum can decide which specific rules (beyond obvious things like threats) they want to tell their Regulars to use this for.
That would give the most frequently-needed & useful capability of Discourse TL4, without requiring careful training of users regarding what they can/should edit, and when & how to use the other functions like topic merge, split, close, etc.
And hell, while I’m at it, for mods to have the option to get a PM generated by ALL flags, containing reason (Inappropriate, Off topic etc) and the subject of the flagged topic/post + oneboxed size excerpt.
This isn’t about having the PM, obviously, it’s about the email it generates when logged out, which assists triage and time management. I can explain more about how this would help if anyone wishes to know.