Ok, another idea I came up with... If the crawler is goglebot.com, for example, and it's hitting the actual forum pages, not the archive, you could use this trick to remove the sessionhash from the templates (see attached files).
The list will take care of all major search engines.
Make sure you enter the actual ['HOST'] name ONLY.
To test it, enter for example:
'mozilla',
It will remove all your session hashes, if you browse with Internet Explorer for example.
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