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The "rdiff" command, unlike the other repository commands "rannotate", "rlog", and "rtag", is not implemented in the cvslib library. It would also be helpful to have a ContextDiffBuilder implemented to parse the context-diff output that rdiff produces by default. We are considering using cvslib as a back end for some version control reporting tools we have written in-house, and this would be an extremely useful feature for us.
This should not be much hard. The parser of context diff is already implemented in Diff module. Development of NetBeans 4.0 is already feature-frozen, so I will schedule this for some future release.