It is necessary for people to have it as it is a MOD not a plugin but a mod. If its a mod only people with the same mod can see the mention but if its a plugin its already in the system so everyone that joins the server will have it so they kinda do for it to work
Do you know how to use a , or a . ?
Sorry I'm going offtopic XD
We are all here on earth to help others; what on earth the others are here for I don't know.
I suggest making a poll about this to see if the community would like to see such a plugin, if not then we shouldn't waste time and effort for something they don't want. And for the people who remain they can use the mod.