I think the point is moot, because I have just checked and the zipstorer project doesn't seem to support svn output. (It is probably OTT for 1 .cs file anyway.)
However, the reason for using a specific version (-rnnn) in the externals property is to ensure that no surprises occur. But when an external project has new features you want to use, you can just amend the revision number and then run all your unit test and integration tests against the new code, before consuming the new features.
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