Yeah sure.
Members don't need to post on the forum first before using the PM facility.
As long as they have confirmed their email address they are good to go.
We used to manually check everyone before using the PM facility but it became realistically unmanageable for us to keep doing that.
We have a new upgrade coming along whereby you will be able to select which members can PM you. You either select "All", "Friends" or "Those with x number of posts".
It's about four weeks away, as we're currently revamping the rentals facility (needs doing) and then we'll get this PM upgrade finished.
Hope that clarifies it.
Justin