Microsoft Support had me set FIM into single request mode to get around an issue in the Beta version of R2. I had to ask for instructions, so thought I’d post them here for future reference:

“There is configuration file for sync service:

C:\Program Files\Microsoft Forefront Identity Manager\2010\Synchronization Service\Bin\miiserver.exe.config

You will have to change default value for “aggregate” attribute of “resourceSynchronizationClient” section to “false”.

Basically, if you haven’t modified this file before and everything is default, then your “resourceSynchronizationClient” node will change from this:

<resourceSynchronizationClient/>

to this:

<resourceSynchronizationClient aggregate=”false”/>

After you make this change you will have to close “Synchronization Service Manager” and restart the “Forefront Identity Manager Synchronization Service”. Once it is done you’re switched to single request mode for synchronization.”