I'm not sure I understand what you're asking, my point was why would you need to?
I do use my handbrake whilst in motion, it is necessary, but only sometimes and only the final yard or so gently. My handbrake uses a completely separate shoe system to the foot brake. If it is only applied whilst still, then the drums rust up and it becomes almost useless. Applying the brake occasionally, keeps the shoes and drum polished and working at best efficiency.