My reason for all of this is AdSense... I'm not bothered about spidering at all.
I manually removed all mentions of 'sessionhash' as appropriate throughout the whole codebase (php & templates).
There's a few subtle ones that linger... for example in the replacement variables for the styles... modify the header to remove the sessionhash from the main image and core navigation.
The page nav bit is buried in admin/functions.php and you can remove the sessionhash from there.
I also then adjusted all of my user options and registration forms to remove the option to not use cookies. And modified the FAQ to say that cookies are compulsory.
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