Hi
Personally, I don't use img height and width so that the image can be modified outside of the editor. That is the larger issue with the client as well....the client also has ftp access to the same directory structure and is confused at times when they change the image size and upload it via FTP but never update the size in the editor. The website stil dislays the previous size and the image appears distorted so they become confused.
Ideally they should always use the editor to make any changes to the html and objects of the page, but its their requirement of me to keep the FTP open so this is occasionally an issue.
Thanks