When you "add billing item" from the matter page, there is a checkbox next to the tasks that defaults to not showing completed tasks. But when you start a timer from a matter page, the task drop-down includes all tasks, including all completed tasks, and there is no checkbox option to not show completed tasks. Please add this checkbox to the timer screen as well.

I would love to have either a timer tab or to incorporate the timers into the billing tab so you could have the timers open and showing without having to hover over the clock icon.