Yes, we know every client has its own requirement on the basis of the requirement he will need to update few functionalities or code to match his requirement. So the extension is open source you can update according to your requirement.
If you want, we can also customize it for you. But customization will be paid. All you need to do is raise a ticket on our support so that our technical team could help you. You can raise ticket here http://support.cedcommerce.com/
Note- Remember one thing do not temper the license information if you are going to use it commercially.