Feature request to go back 15 seconds while recording

I am a university professor and use TSR product to record video lectures.

This product is really nice for me. However, there is one feature that is preventing me from moving over from SCREEN-CAST-O-MATIC to TSR completely.

I NEED A WAY TO GO BACK A FEW SECONDS OR A MINUTE WHILE RECORDING VIDEO.

While recording lots of things happen, I make a mistake, someone shouts in the background, my dog barks...... 

Right now the way you designed the product is not practical for me. I have to STOP, UPLOAD, EDIT, AND RESTART using the web editor. This process takes 10-15 minutes and wastes my time each time I need to rewind a few seconds.

Please introduce "Go back 15 seconds" feature in the recorder. 

I have tried to use your product four times and stopped it because I constantly have to go back a few seconds or a minute while recording my lecture videos.