[Twisted-Python] Inheriting from both pb.Cacheable and pb.RemoteCache?

Hi! In the PB howto, it mentions that it's typical and fine to get bidirectional synchronization between objects by inheriting from both pb.Copyable and pb.RemoteCopy. Is the case the same when it comes to Cacheable? I want a client to log in and grab attributes of objects as needed from the server, and any changes made to the objects on either side ought to be replicated on the other end. This looks like the way to accomplish that, but I want to verify my suspicion before Twisted bends my brain again. :-) Thanks! Steve