Unfortunately at this time this is not possible. While the contact form does have an address (URL), linking to that address will not have the desired effect. The address changes frequently to keep it from being harvested by SPAM machines.
If you want to provide a direct link to contact a staff member, create a link to their profile page. From there the user will be able to click on a link for the contact form.
Another option is to use the staff directory listing to display the contact information for the staff member. See the staff directory manual for more information.