I'd like to see the ability to replicate the vault across multiple locations to prevent having to check in/out parts across a WAN. This includes the data-store in addition to the vault database itself. At the very least, allow the vault database to be replicated (in real time, metered, and/or scheduled) and the data-store to be run in a DFS/FRS (Distributed File System / File Replication Services) which would likely be more efficient.

Ideally, it would also allow bandwidth controls so that large additions to the vault would not hog bandwidth choking other enterprise processes running across the same link.