Adding content to notifications

I've had success with this module and placed a "messasge the author" link on the node template.

This works ok, but the node send from isn't apparent, which would be very nice.

I'd need to pass the $nid of the node in the link created. With clean URLs would this be...
<a href="privatemsg/msgto/2&49">Message the Author</a>
...49 being the node id.

Then in the privatemsg.module file I could add it to the parameters and use it to load the title and end up as great info in the private message and email notification.

What I don't know is:

1. Is that link valid?
2. What functions need the $nid parameter to carry it to the message and notifications?
3. How does the parameter end up as a !title alias or perhaps I could just use $title?

I think I can alter the messages fine once it comes through.

I LOVE DRUPAL!