I have a site where one folder contains PHP scripts, and thus the owners of the
site must not modify content in that folder.

One way to acheive this is to add all other folders to the list of folders
that they can manage. The big problem with this is that they can not manage
content in the root folder for the site.

The only way to allow them to access the files in the root appears to be to
add the root itself to the list of folders they can manage, but this then
grants them access to the folder containing the scripts.

Any suggestions?