Persistent Config?

[eluser]liamstask[/eluser]
Is there a recommended way to programmatically update info in config files? I'm just getting started, but ran into 2 issues:

1. Not all the CI supplied files in the application/config directory can be read with the Config class - bummer!
2. Config items cannot be written back into the files - double bummer!

Specifically I'm hoping to create an installer that will allow users to enter database connection info into a form-based wizard. Everything else I guess I can just read and write from the DB...

Thanks for your thoughts!