Ability to use Keyboard to type phone numbers or extensions in JustCall Dialer

I make calls through my computer using the JustCall Dialer integrated with Zoho. When I am making a call, I would like to use my keyboard to type in the numbers on the dialer. If I'm in a call that requests an extension to reach someone, I would like the ability to use the keyboard (num-lock keys) to type that extension instead of clicking with my mouse. Sometimes it is a challenge to hit the extension in a timely manner. Thanks!