I was hoping that "Replication Objects Remaining" would be the monitor to help watch DFS-R backlog, but that graph never twitches, no matter how much is sitting in the queue.  I've googled the WMI behind it, and I'm still uncertain what exactly that is supposed to be monitoring... but it's definitely not the backlog.

So, does anyone know of a way to get OpManager watching a server's DFS-R backlog?

Thanks