"if you want to add a css suffix to a module that does not have that option, you should be able to add the option simply by adding the following into the module's xml file...
[code:1]<param name="moduleclass_sfx" type="text" default="" label="Module Class Suffix" description="A suffix to be applied to the css class of the module (table.moduletable), this allows individual module styling" />[/code:1]
...just add it in as the first param in the list of params. This is one module param that gets grabbed by default by joomla main module code. All you need to do is add the option into the xml file."