Hi MV, I'm thinking that the Admins should install the "Social Groups" Forums add-on. This would work perfectly with the "Clan Recruitment" and if /party was installed (@DjRyan made a thread about this), it'd work like, beautifully. Link: https://xenforo.com/community/resources/social-groups.3443/
You could just start a conversation with multiple people.. also, this wouldn't be able to be monitored as far as I know, and with PM's already not being able to be seen, I don't think we need more things that enable people to harass,, break the rules and get away with it, it might also cause drama and public fights which aren't appreciated on the forums, there's always skype, conversations etc.