The old content designer (ewebedit400) editor contains options for removing buttons from the editor.
Comment out the appropriate tool name from the file in the [SiteRoot]\Workarea\ContentDesigner\configurations directory.
For most standard content the StandardEdit.aspx file will be leveraged.
The InterfaceBlog.aspx file is leveraged by the CMS when posting a reply to a forum or blog
As an example if you wanted to remove the cut button when editing standard pieced of HTML content you would comment out the entry from the StandardEdit.aspx file.