Show or Hide the Color Table
Menu: Window Showing/Hiding Color Table
Select Multiple Contiguous Colors in the Color Table Palette
Mouse: Shift + click a second color
Click the first color to select it. Shift + clicking a second color selects all the colors between the two colors. The second color you click becomes the current foreground color.
Select Multiple Discontiguous Colors in the Color Table Palette
Mac: Cmd + click a swatch
Win: Ctrl + click a swatch
The last color you click becomes the current foreground color.
Add Current Background Color to the Color Table
Mac: Option + click the New Color button
Win: Alt + click the New Color button