Similar technique would be used for manuals as well. You'd heal-toe on a hill so you don't roll back, same with downshifting and slowing down quickly to make a turn.

For the record, in 99% of driving scenarios, you probably don't want to press the brake and gas at the same time. For the 1%, you can do something called brake boosting. This is where on turbo cars, you brake to maintain a slower speed, at the same time you press the gas to spool up the turbo, which results in you having little to no turbo lag while racing.