The "Special Feeds > Unread Items" does not allow a "mark all as read". The only option is "delete all items".
Selecting delete does not remove the items from the feed listing.
Ex) I had 76 bold items in the "News" feed folder. I had 76 "unread Items". I clicked "delete all items". The items in the "unread items" were removed; however the 76 bolded items under "My Feeds" remained. The only option is to separately tell "My Feeds" to mark all as read.
That is promlematic since as I'm reading the newspaper view of the "unread items" new feeds arrive, so that by the time i'm done reading through there may be 5-10 new unread items. I only want to mark those read that were included in the search folder at the time I said "delete".