This enhancement is part of WPS 6.1 and for custom jsp of wcm can be deployed as separate j2ee ear application on portal. Deployment and update of jsp now can be performed remotely.
also. J2EE resources like jdbc, webservice client,etc can be used without updating wcm product files.
within any other Web application running on portal. When referencing JSP files in another Web application, use the following path: contextPath;jspPath
For example: /wps/customapplication;/jsp/editor.jsp