XF 1.4 is there a way to add private msg in the forum?

If i write a post i sometimes want to add something for a specific user only (and vice versa)
like a character sheet, or in character whispers. (the whisper needs to stay in the original forum.)
Is there a way to do that? I know i can do it with bbcode for admins, mods and groups, when i search through addons, but i could not find similar for users.
i could create a group for every player .... but thats not what i would like to do.