My suggestion is creating a Button in Guildless users' profile like "Invite to the guild",
once this button is clicked - it Pms the user and enables him to accept the invitation or cancel.
I see many guilds which are based on "Invite only" so in my opinion this function makes it easier then asking them on pm to request joining etc.

Example:


This post was edited by NiRo_O on Oct 2 2012 05:00am

I rather not receive a auto-pm for this.

But it does sound like a good idea being able to invite people into the guild by sending a invite.

Voted yes for invite.
Voted no for auto-pm.

Voted yes ofc

Voted yes. Would be great add.

yes

Actually a very cool idea! Yes'd!

yes

You can even take this forward and disable on some guilds the request to join option and make it Invite only.

Yes please.

Voted yes, great idea!