Hi Pscorca,
In Reporting Services, the dynamic file name feature is only supported by the Windows File Share delivery extension natively when creating a subscription. In addition, you can also try the workaround posted by Sorna.
I would suggest you submitting a wish at
https://connect.microsoft.com/sql.
Connect site is a connection point between you and Microsoft, and ultimately the larger community. Your feedback enables Microsoft to make software and services the best that they can be, and you can learn about and contribute to exciting projects.
Regards,
Mike Yin
TechNet Community Support
