New "building" type, with a manual add (+) button for completed TASKS

I understand that the current concept is based solely on the Pomodoro technique. However, it would be nice if Build Focus also had a function which gives the user an optional choice of manually giving the city an extra boost when a single hard task has been completed. The "easy" way to implement this would be to add a plus sign button, where a click would add a new "building". Preferably a different type of "building", which shows that those buildings have been manually added. Like a park or a pond etc.