emanuele wants a @* to mention all the members in a single user of the forum.
Eliana, it depends how you use the forum. I find it quite useful, because I don't use the unread/unreadreplies, I prefer to go through the topics I see those posted recently (or those I may be interested in the moment I log in), so I use the mentions as a sort of bookmark (I have a couple at the moment "unread" because I know I have to remember those two topics).