How to use Multiple REPORTS_PATH for Single Report Server with out using Dynamic Env Switching

Hi ,Iam using Oracle Forms and Reports 11g R2 . I have One Report Server. My Requirement is to have two Reports_Path values to support for Testing and Dev environments. I have tried Through "Dynamic Environment Switching" , but there we need to provide ENVID value at the end of URL and if we made one of the environemnt as defaultEnvId then both environment URL's will take reports executables from the default environment.
But my Application is developed already without ENVID in the URL so i can not pass ENVID at the end of the URL manually for each report.So i cannot use Dynamic Environment Switching and also we have restriction to use only one Report Server.