A question which is often asked by customers and partners is how to submit an enhancement request for Enterprise Vault. Historically there have been a variety of different mechanisms which have been consolidated in to the following:
Submit an Idea on the Symantec Connect Forums.
This article explains it.
That area of the forum is monitored closely by Product Managers (and other people too) so the idea will get reviewed, commented on, discussed, and debated in time.