Correct, no posting required. Still browse around a bit while you're here, check Server Alerts, News and Announcements, etc, but other than that just log in
Yes. It's recommended that you browse around the forums for just a few minutes so the you can be sure that the forums record your login properly.
If you are ever suspended for inactivity, login to the forums first, browse around for a minute or two, then go unsuspend yourself. That way, the forum login record will be current after unsuspension and you'll have another 31 days from there.