I like to filter unread log entries and then select a type (i.e.: Session hijack attempt)
Then I select all the records shown, and add to blacklist
Then I need to go back, re-select them and Mark as read.
It would be nice if after I press add to blacklist, to keep the records selected so I press the mark as read button, or you may add a new button "Add to blacklist and mark as read"