New Post: Config file modifications during package installation

XDT used to be a proprietary Microsoft technology that was just recently open sourced, so it haven't been easy for anyone to support this syntax but hopefully it can make it soon till the C1 Package Manager.

I have no idea though how to remove elements on installation, neither with XSL or xml merging (XmlFileMergePackageFragmentInstaller)

In regards to CompositeC1Contrib.RazorFunctions, do you have any specific reason for keep using it with C1 4.0?