Our organization also has a need for duplicate records as it pertains specifically to our agencies that submit releases on behalf of many clients.
We were able to do so with a JavaScript on the CMS side that prepends a certain prefix that is later removed upon sync to SFDC.
See this thread that I originally created back in November: Business need to create duplicate record
Thank you Jenn DiMaria Dan Stevens Geoffrey Krajeski,
Let me read your answers and try to understand
Let us know what you decide!