Make permanent changes to config files for Laravel 5 via GUI script

I'm using Laravel 5 and building an app that will need to be able to add /edit additional filesystem settings via the application itself, instead of doing so manually. I want to be able to add new config settings via a GUI instead of manually.

I found reference to this: http://ift.tt/1sVv9m3 but it appears to have some issues with Laravel 5.

Is there another / better way to achieve this?

via Chebli Mohamed