Being able to pause and resume a recording gives you more flexibility with your videos.
While recording your video, you will see the control menu on the lower right corner of the screen. These are for:
The first button is for toggling Pause/Resume (Alt+Shift+P). You can change the keyboard shortcut keys in Chrome's extension settings page.
Right next to it is the Stop/Finish Recording button. Once you click on it, it will open a new tab for your new video's share page.
The last button right next to the timer is the Restart button (Alt+Shift+Z).