It would be very useful to us if there were a history brush tool in Adobe Audition.
For example you are removing breathing sound from a voice clip manually and after finishing the work you suddenly notice that you have made a part of the voice silent mistakenly in the beginning. Now you need to go to history panel, undo all of your work and then need to do all the work again. If the voice is longer the frustration would be worse. But if there was a history brush tool then you just don't need to take all these trouble.
So, please add History brush tool in Adobe Audition to undo changes in a part of an audio.