Windows Client Feature Request - Cancel/Discard Button

Please add the ability to cancel a running timer and not record the time at all.  Sometimes I press the start button and I only work for 2 min and then I get a phone call.  Maybe I remember to stop the timer right away or maybe I forget to stop the timer until the end of the call, but wither way I need to go to my timesheet and delete the time entry.  If I had a cancel button I wouldn't need to do that.