Same like other modules, CS Components have been activated in standard SAP ECC.
If you want to have some new functionality, then you may need to activate business functions.
As CS is combination of SD & PM, I don't think there will be a problem in running the process or doing the configuration in standard system. If you want to add anything new, all those business functions will mostly come under within these 2 modules SD & PM. May be some business functions are related specifically to CS.