Currently, you can select source control depots via the Source Control Management section in a project's configuration. I see how this can be very useful when you've got unique source distributed across several locations. Our organization has a slightly different scenario. We have the same source tree but it's replicated at different locations. It would be nice for us if we could select to choose our source control depots based on node rather than project. Then our slaves located in different cities could access their local source control systems for their checkouts when building the same projects.