Add a .skillconfig.md configuration system

As I've been using skills and sharing them with team members, it has started to become obvious that there needs to be an easier way to paramterize / customize skills without needing to copy paste a bunch of the skills around. Would it be possible to have a npmconfig / gitconfig type system (though probably an .md) that users and codebases could leverage to tweak skills by using variable replacements / additional context and steering from this file?