a option to reference someone who hasn't comment on a thread

[BrokenPegasus]

this would be like @USER_0909 and that person would get a notification about it

 

[OfficialJesseP]

this would be like @USER_0909 and that person would get a notification about it

That's already a thing, you can @ anyone regrardless if they've commented on the thread. Example PlayerSquared Bot.