System->Prefs->Appearance->Visual Effects has three choices: None, Normal or Extra.

If Compiz Config Settings Manager (CCSM) is not installed, those choices do make sense.

However, once the user installs CCSM, it would be nice if Visual Effects included a fourth choice, Custom, next to which there would a button to Open Compiz Settings Manager.

When CCSM is not installed, the Custom button and compiz link would be ghosted (unclickable), with a little line reading "You must instal CompizConfig Settings Manager to customize visual effects."

Custom could be designed to always remember the most recent Compiz configuration. That way, if you want to temporarily disable visual effects, you could just click on None, and then later click back on Custom, without having to go back into CCSM and re-specify your favorite settings. (Currently, when the user disables visual effects, his most recent Compiz configuration is forgotten, which is unfortunate.)