Enabling it adds a Keyboard Shortcuts tab to the Settings menu. From here, you can define keystrokes for a variety of functions including searching, starring messages, and navigating your inbox. You can remap the default keys or just add alternates. To disable your custom creations at any time, just click Restore Defaults at the bottom of the page.
If you’re a fan of Gmail’s category feature— which auto-labels messages as social, promotions, updates, and forums—you’ll likely love this lab. Smartlabels adds purchases, travel, and finance to the Categories section of the left menu and sorts your incoming messages accordingly. Though it’s pretty accurate, it occasionally mis-sorts a message. You have the option of re-categorizing any email using the Smartlabels drop-down menu within the message.
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