For the Brush tool we should be able to change Size, Feather, Flow and Density with simple gestures.
I suggest the following :
• Hold Ctlr + scrub left or right = increase/decrease Size.
• Hold Ctrl + scrub up or down = increase/decrease Flow
• Hold Alt + scrub left or right = increase/decrease Feather.
• Hold Alt + scrugb up or down = increase/decrease Density.
Switching to Erase Brush should happen by clickig on the Option.
Brush Size should change by fine steps of 0.1
Flow, Feather, Density should change by steps of 1 as they do now.