Focus Timer - Flowtime option

The Focus Timer looks great and functions well, but not everyone benefits from the pomodoro technique. I've found that the Flowtime/Flomodoro technique works much better for me because it doesn't arbitrarily break focus. I would love to see an option to use Flowtime as well as pomodoro.

Flowtime basics: Alternate focus/break time just like pomodoro. Focus time length is not set. When you complete a task or feel like you need a break, stop your focus timer. Your break timer is then calculated by how long you focused (usually 1/5). 25 minutes of focus = a 5 minute break. 1 hour of focus = a 12 minute break.