Using modifier keys to uncover in-menu options.
Spring-loaded Commands
By default, most menus transform the cursor into the Hand tool or Move
tool. These tools can be used on the canvas while the menu is open to pan
the document or to adjust settings, such as the Angle and Distance settings
for a Drop Shadow. More tools, however, are available via spring-loaded
shortcuts. The zoom tools can be accessed using either Command (to zoom
in) and Option (to zoom out) or Command + Space (to zoom in) and
Command + Option + Space (to zoom out). The hand tool can also be
accessed by holding the space bar.