is there a way to have in the dodge/burn tool the flow like the brush tool?

norman.sanders  wrote There is a way to Dodge and Burn using the Brush tool with its features.  It has the added benefit of putting the Dodge and Burn on a separate layer where it can be edited repeatedly without corrupting the original image. Here is how to do it. (It takes longer to describe than to do.) 1. Load a file to be retouched and add a blank layer. 2. Choose Edit > Fill and from the double-arrow options of the Use field, choose 50% gray. Then click OK. The image area will become gray overall. 3. Change the Blending mode in the Layers panel from Normal to Overlay. The Background image will return although you will be working on 50% gray layer. 4. Do not use the Dodge and Burn tools. Choose the Brush tool. 5. Painting in white will Dodge (lighten) the area, Black will Burn (darken) the area. Strike the D key to place Black as the Foreground color and White as the Background color. To transpose them strike the X key.  Although the image will reflect the changes, they are being recorded on the 50% gray layer. Your brushwork my be viewed by turning off the eye in the Background layer. Best of all: to undo any tone adjustment and return the area to its original value at. any time. now and in the future, simply return that area to 50% by cloning from an adjacent unretouched area of the 50% gray layer.

Woah there Norman.   It makes me cringe when folk think like a photographer, and sell two of Photoshop's most useful tools short.

This is Dodge & Burn

And this with a 50% grey layer set to Overlay with 50% opacity black and then white strokes.

OK you can darken or brighten areas universally, but if just want to do that I'll use curves or maybe even levels.  Being able to target tonal  ranges  with the D&B tools not only gives me control of which  pixels will and will not be affected, but also affects saturation differently according to what tonal range the tools are set to, and where particular pixels fall in the tonal range.  This is a powerful tool no digital artist or illustrator should be without, and even useful to folk who just use Photoshop to tart up a few photographs!  

And you can still use D&B non-destructively by copy merging layers and using layer masks.  You can also use 50%  grey layers in conjunction with luminosity masks,  but  you'd need a bunch of layers and masks, and heaps more time.  

For what it is worth, years and years ago I used to feel smug using 50% grey layers, but I was put straight by some of Bert Monroy's Pixel Perfect tutorials.   I 'think' you can still access the Pixel Perfect videos without a subscription, but there is certainly no problem for anyone  with an orange badge.

Pixel Perfect - Complete Series : Revision3 : Free Download, Borrow, and Streaming : Internet Archive