Since I'm always interested in news of the SF Fiber rollout (and currently in the state of the 5268 bridge mode thing), I visit the forum every day. I press the "show new posts" link, which, conveniently shows me new posts. That page, however, does not have a "mark all forums read" link as there is on the main forum page. It'd be rad if it did, because then I wouldn't have to click back to mark all the forums read.
I do see a "Mark topics read" link at the top of forum page. Is that what you're looking for?
Bill