There may be a way to build a custom template, but from the very beginning there should be the ability to change certain settings.

For my particular case, I wanted to build an Angular project using the old modules, and I wish I could select scss from the beginning. I might not have yet found how to do it, but couldn't some common options be available at project creation time?

Or at the very least, a button that says "customize this template" that takes you to a guide or a graphical interface to twiddle with different aspects of the template.