Two brushes are better than one
To rapidly change the Size, Feather, Flow, and Density of a brush, use the A and B preset brushes. To set them up, click one of the brushes (A or B) and change its settings. Make one brush large with Auto Mask off for painting areas such as back-grounds. Click the other brush and make it small with Auto Mask checked on for ?ner detail and edge work. Press the Forward Slash key (/) to quickly switch between the brushes.
Is this a Lightroom tip or a Photoshop tip?