For members only, there is a new transaction on the action node 'Set Done'. This allow you to select multiple actions in the tree and set them to done in one go.
On the Review Actions screen, you can also select multiple actions directly from the list and perform the following operations on them: Delete, Set to Done, Reprocess, Change context, Change Topic or Postpone (new transaction).
For more details on the latest functionality available, see
http://trgtd.com.au/index.php?option=com_content&view=article&id=68:modrelnotes&catid=41:releasescat&Itemid=82