I mention a number of shortcuts that are new to the Spot Removal Tool (B) in this video (Adobe Photoshop: Favorite Features for Photographers), but thought that it might be handy to also include them in list form:
• Tap the “V” key to toggle the visibility of the spot overlays.
• Shift -drag constrains the brush spot to a horizontal or vertical stroke.
• Shift -click connects the selected spot with the new spot via a straight brush stroke.
• Command -drag (Mac) | Control -drag (Win) will create a circle spot and allow you to drag to define the source.
• Tap the Forward Slash key (/) to select new source for existing circle or brush spot.
• Press Delete to delete a selected spot.
• Option -click (Mac) | Alt -click (Win) on a spot to delete it (the cursor will change to a pair of scissors).
• Option -drag (Mac) | Alt -drag (Win) in the image area over multiple spots to batch-delete (the icon changes to a marquee while dragging.
• Tap the “Y” key to toggle on/off Visualize spots. Note – this is also available as a checkbox and slider in Toolbar.