Back to the original question - if you wanted to develop them a site in Dreamweaver instead of using a CMS - have you looked at Adobe Contribute?
What you would do is create pages based on Dreamweaver templates and leave the areas you want them to be able to change as editable regions as usual.
Contribute works like a browser, they navigate to the page they want, click the edit button, do what they like to the editable regions (the rest is locked by the template) click the button to save and the job's done.
A CMS will serve (sorry!) just as well but if you want to use DW, or can't be bothered to configure a CMS to get the look you are after this might be something you want to look at - Contribute is commercial but if you have a legit copy of DW you'll possible find you already have a copy.
If what they want is very simple you might just want to use an online wiki like
Wiki - Free Website - Wetpaint. I've got a bunch of design students using this at present with a good deal of success and not much help from me.