regards the "!$may_cache" not above: What they were trying to say is things like "drupal_add_css" that used to be in that section should now be moved to "hook_init." AFAICT there is no equivalent section for real menu entries, but it is possible to use "hook_menu_alter" or "hook_menu_link_alter." I have not used either of those hooks yet. In the one case where I needed to alter the menu, I just included a line to clear the menu cache.
Also, now that a patch is available, I don't think this should be "critical" any more.
