If you are only rarely working with the Shell Integration and additional recursively modified state is not important to you, you may completely uninstall the service. This can be done via the Control Panel/Add or Remove Programs, selecting the SmartSVN installer, Change and within the installer using Change again.
The Status Cache settings are stored in
%COMMONAPPDATA%\SmartSVN\statuscache-1, which is usually
C:\ProgramData\SmartSVN\statuscache-1. System properties can be configured in
The SmartSVN Status Cache service runs under the system account and hence does not know about your SVN