So I am a web designer and Developer and having a nightmare client at the moment as you do.
 
He is an ex developer (coldfusion) and he does not have his company any more. He does not really know anything of the web currently. He probably is still a good coder but is a real pain in the ass and not a nice guy. Always on the attacks and insults.
 
Anyway.
To cut a long story short we have given him full access  to files like templates etc which clients normally do not have.

He wants much more of his site and not the money to pay for it so we basically letting him do it himself (Or try).
- Recently I noted some issues with the header code, a content holder as it is with a tag calls up scripts so one change effects all templates. 
- As any developer I use software to code and FTP up. (Coda)
- The CMS we use a lot (and partner of) has a very good admin system and you can view and do basic edits to templates and other files through the admin. This is done through your standard WYSIWYG editor and has a html viw.
Thing is it is an editor and they are mainly there for the beginers and small changes. These things will try and look for errors in code etc and try to fix them. When used for content it helps (or tried) to get clients layouts correct to best.
In terms of developing - no.
- Despite having FTP access and ability to do it the right way this guy has been trying to code in the EDITOR! and of course with tags and things in templates it is not liking all that so much.
 
So he moaned about it today. When I pointed this out (In the client to company manner you have to be in) So was informative and polite, he just goes on the moan and complains etc, insultive too.
 
I really wish you could say "Tell any developer out there you trying to develop through an edito and see how big their laughs are"
 
Clients, really at the moment are the viend of any designer and developer at the moment.
 
Big hate by the way is "Can you make my logo bigger?"
 
GRRRR