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0e1f616
(Get the code!)
That would work OK for home directories but not for everything else. There are several shared directories in the volume; they are expected to be at paths like "/data2/share1", etc, so they wouldn't be able to use a parameterized mount like the home directories. This still leaves us with ownership and permission problems (on the shared directories) in the case where a second user logs into the same system where someone else is already logged in.
On a related note, the polydirs also helpful for getting around cases where pam_mount fails to unmount a volume. It may only be because one user's polydir is invisible to other users, but I suspect that the namespace teardown is actually more reliable.