Looking for a specific "stopwatch" program, can you help?

Hello Major Geeks, I need your help!

I am looking for a particular kind of stopwatch-like program, one with a couple of features usually found on the most priced casio chronographs. Have you ever seen anything like the following?

I need to have 2 indipendent timers to manipulate (meaning, stop/start): like, time at which one guy is talking, and time at which he is gesturing. As well as the sum of such timers.

Final result should show something like:
Time A: 3 secs
Time B: 7 secs
Sum: 10 secs

It's for science research purposes. Thanks for any help! :wave

 

Thank you! But I think it can't do sums... I need to know at all times what Time A + Time B is.

Let me explain with an example, about this research I'm doing. A guy is sometimes talking, sometimes gesturing: I need to stop him when he's been doing that for 10 secs, in total. If he has been talking AND gesturing for just 5 secs, then I'll stop him because that will be 5+5=10 secs.

 

I settled down for this other solution, but I still need help. I will track both behaviours A and B on a single track with Multitrack Stopwatch, then save the log about the time periods (not specified if coming from A or B) and then confront it with another input which says what each period actually is, if A or B.

But other things don't work for me yet, so I will ask in another topic.