Please understand, there is no need for VB3 to have this hack.
The Archive system is designed to feed the robots. Besides the main forums are indexed by Googles etc due to the removal of session ID from the URL. The script detects spiders by its user agent and disables the session ID if found.
If anything, one might want to shorten the Archive's URL to potentially increase the ranking. eg.
/archive/index.php/f-35.html
to
/arc/f-35.html
This can be easily achieved by using rewrites.
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