Perforce - shared client/workspace between build configurations

Hello,

We are currently running TeamCity 7 with Perforce, using agent side checkouts.  

The default behavior seems to be that each build configuration will create and use a new client / workspace on the agent.  Even if a client spec name is specified in the build configuration, it's only used to create the mapping for the new workspace.  

Is it possible at all to share the same client / workspace between 2 different build configurations?  Doesn't look like it's supported, but I would just like to confirm.