You can now select more then one item by clicking and dragging a box to select them, and there's shortcuts for adding to a selection (holding shift while dragging), subtracting from a selection (hold control while dragging) and switching to "within" selection mode (hold alt while dragging). Shift clicking an already selected item will remove it from the selection. There's also shortcuts and menu items for selecting all items, clearing a selection, and inverting a selection. It's also possible now to select items which are hidden below other items by control-clicking an item, or by using "Select next item above/below" in the new composer Edit menu.