Version 2.1 Update Information
Library
library tools - manipulate the library
track status - colour codes give more information on the track
track tips - see the full name of the track if its not completely visible

Mixers
shift and click - will preset the given component with the current value, without having to go through the mixers settings dialog to do the same thing.
talk over - mic input is muted and when activated the mute is released and all outputs levels are attenuated by a given percentage. Keyboard activation via the scroll lock key.

Carts
shift and click - will preset the given level or pan with the current value, without having to set it manually on the details panel.