Feature request for PHP on windows

How about using the registry to store the location of the php.ini. It could default to c:\windows for backward compatibility. I currently have multiple versions of PHP setup on the same system. This works fine, as long as I don't use the ISAPI module because the path to php.ini is hardcoded to c:\windows with the dll. I'd like to test ISAPI configurations before "going live" but still have the ability to easily maintain/update to newer versions of PHP. The folks at Zend have done exactly that in their bundled version of PHP.