Option to only allow one timer to run at a time

It would be great if Timepost had an option to only allow one timer to run at a time. Rarely do I want two timers to be going at the same time -- I can only work on one thing at a time. Perhaps this could be a preference "Allow multiple timers to run at the same time."

Right now it takes several clicks to switch from one timer to another from the menu bar.

Click > Pause > Click > Select New Timer > Click > Start

With the "Allow multiple timers to run at the same time" preference unchecked, there would be a single list of timers in the menu bar dropdown, instead two lists (active and inactive). Choosing a new timer while the clock is running would pause the first one and start the new one.

In the window, I'd love to see it work more like Harvest, where there is a play icon on each timer. Clicking on the play icon of a new task would start the timer for that task and pause the timer on the previous task.