[GWMPT]

Well, what you can do is to create the user which the home directory is the web server folder you want.
And then, you execute chmod command to give / remove rights.

Like, you have 3 folders in the web server directory, called "system", "design", "modules" for example, then you do things like:

Code:

adduser system -d /var/www/html/system
chmod 700 /var/www/html/system
adduser design -d /var/www/html/design
chmod 700 /var/www/html/design
adduser modules -d /var/www/html/modules
chmod 700 /var/www/html/modules

That should do the trick i guess, the unique thing which can appear is the apache "access denied" error, not sure though
And you may chmod the forum / other files, so they don't have access to it.
Instead of that, i don't have any idea to do such thing.