Perforce Client views and polling

I am trying to setup a project to poll only for specific changes as related to its //depot/project.  This is easy enough as I can specify that in the materials section.  However, this build will also use source from other projects in the depot (//depot/project1/..., //depot/project2/..., etc).  Usially this source is just common files used for building.

Since these are just not projects I wish to monitor for changes, I did not include them in the client view definition in the materials list.  I would like to pull them as needed, however since they do not belong to the client view this is not possible.  This is something I can easily do in subversion.

Any ideas?