If I forget to start or stop timer, I don't have any way to recreate my last few actions, so I don' t know how much time I need to write off or add. If I was able to see my last action or two, I could better estimate how much time I'm off by.
In other timers I've used, each time I start/stop there is a new timer (it inherits information from last time I ran that timer, but logs it as a new timer, so I can change the description, etc), and it displays the start and stop time for each timer, so I can easily recreate my path.
How often would you use this request?
Currently I'm still using my old timer as a safety next, but that's clearly not practical for the long term. I catch a mistake starting or stopping a timer often enough that if I didn't have a way to retrace my steps it would get expensive. Maybe at least 1x/wk. When I'm busy with many moving pieces it's easier to make a mistake, and that can be expensive if I then end up writing off time that I worked.