I do not even know about RenTech. I was just pointing out that there are several tiny hacks one can do to significantly expand capabilities of linear regression

I do not even know about RenTech. I was just pointing out that there are several tiny hacks one can do to significantly expand capabilities of linear regression. Just like you can do polynomial regression with some data modification, you can do practically anything I mentioned above. It's very simple, modifications you can use in minutes.