This is a really important principle of making APIs that people don’t really talk about. There’s a fine balance between hardcoded literals and full-gui options menu.

I think this principle might fly under some people's radar because it has been a solved problem for decades.

Even Makefiles don't require changes to the file to be configured. They take environment variables as input parameters, an approach that directly and indirectly permeated into high-level build systems. One example is the pervasive use of the VERBOSE flag.

After all these years I only had to tweak build config files by hand when I wanted them to do something that they were not designed to do. All build tools I know don't require it. The ones linked with IDEs already provide GUIs designed with this in mind.