We released a new version of ConfiGap that now supported auto-updating for OSX users. We also addressed a minor build issue for Windows users. You can download it from http://configap.com/.
We are looking at extending this tool so it will work with non-PhoneGap Build config.xml files. Under the hood, we are looking to migrate the code base to Angular 2 and Angular Material.
If there is a feature you want to be added into ConfiGAP, just let us know.