Customizing acceleratorstorefroncommons addon

I have created custom B2C accelerator code using modulegen (and b2c_acc recipe). I want to customize abstract controllers in acceleratorstorefrontcommons to customize login and registration code . As best practice, we should not change code in OTB hybris files.

What is the best approach to customize code in acceleratorstorefrontcommons extension? 1. Can we create a new extension using acceleratorstorefrontcommons as a template? If so, how do we do it? 2. Can we create an empty addon and make it depend acceleratorstorefrontcommons? Steps to achieve this? 3. Copy files from acceleratorstorefrontcommons manually to the my storefront extension and change code?