Ctrl-C Copies the current time in milliseconds to the clipboard. Hold Shift to copy the current time in a custom format (by default h:mm:ss.ff). This format can be changed in settings.cfg.
Right / Left Arrows Move by one tick in the arrow direction. Hold Shift to move by 4 ticks instead. Hold Control to move to the next / previous bookmark instead.
Alt Show cursor position in storyboard coordinates instead of the current time. Also allows the storyboard to be visible outside of its usual bounds.