We were unable to find one product that would fulfill all of your needs.
However, what you want to do can be accomplished by using three products
together.
Shiva offers zone security: putting the LaserWriter in its own zone
with restricted access solves part of the problem.
Farallon's Traffic Watch allows the user to calculate traffic volume and source
for a particular node.
Apple's print server software gives the user a page count for each job.
This is a less than perfect solution, but it does give you the results needed.
For more information, search under: "Farallon" and "Shiva"