Max,
If you agree, I can add the following functionalities:
- a project property page to change the web content folder of an existing project

This is what is missing - and I would say this should be submitted to eclipse ASAP :)

Here's the new issue report: https://bugs.eclipse.org/bugs/show_bug.cgi?id=286258

I'm fairly confident I put it in the right place, but feel free to verify and/or update.