There's a fantastic hidden gem in Photoshop allowing you to resize the brush tool dynamically by selecting the tool and right clicking while holding down the
alt key. Vertical mouse movement changes brush diameter; horizontal mouse movement changes brush hardness.
It should display a red rendering of what the brush will become, but sometimes I don't see the red (just a circle), and it becomes impossible to guess what the brush will become simply by observing the UI widget's numerical values. Anyone aware of a setting that will make this feature display the red?