Do the numbers-shortcuts not work for you?
The problem with the number shortcuts is that when using the brush a number changes opacity and shift+number changes flow. When using the airbrush that reverses - a number changes flow and shift+number changes opacity.
Unfortunately I don't know of any way to change that.
You misunderstood the question – numbers work fine. However the shortcut changes depending on whether your brush has airbrush enabled or disabled. I would like to set the shortcut for good so i can use a brush without airbrush option and still be able to change flow just by a number without using shift.
Thank you very much