... the ability to begin recording each capture at the same time. (single start and stop for record of two screens)
As you can see in the idea backlog (scroll down to capture category), it is a quite popular request. Currently I'm working on something else, but during the next batch of work on the capture screen it will be evaluated and hopefully implemented.
Thanks, Joan. Along those lines, I have added an idea to the idea backlog that when doing 2 screen captures, the output file designation number for screen capture 2 could be +1 from screen capture 1.