We often change our minds in the middle of a project. You can quickly set your brush Radius and Feather amounts as you paint:
Press either the Radius or Feather Brushes in the Composition Toolbar.
Press Cmd (Ctrl) and click anywhere in the Composition window.
Then drag in or out to resize the brush.
To change the value by larger increments , hold down Shift as you drag.
The Eyedropper Tool can select a color to paint with from a sampling anywhere on the desktop.
Press the Escape key to cancel the Eyedropper.