[boost] [graph_parallel] Is a distributed directed edge list possible?

Is it currently possible to represent a highly connected graph where any given vertex may contain more directed edges than can be held in a single process' OutEdgeListS? I see that the distributed version of adjacency_list allows vertices to be distributed across multiple processes in a process group, but I don't see the ability to allow directed edges to be distributed across multiple processes. Is this an intentional limitation? caustik