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Most of the JUnit and CPPUnit tests are not unit tests!

Correct. We use them has as generic test harnesses. We would like to get more unit tests, but at the end of the day the most important tests for us are the ones that show the system works. It would be awesome (!!!) if someone makes it their mission to add more unit tests.

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Should we really be adding more features, such as multi-txn? This is a question we ask everytime someone submits a new feature suggestion that is just a simple addition. Features tend to make the system exponentially more complex, so we need to be careful of them. However, there are some things that are really needed. For example, ZOOKEEPER-22 is desperately needed. It would drastically simplify the use of ZooKeeper. SSL is also on the roadmap and is needed as are other authentication protocols such as kerberos.

Why don't you accept my cool simple extension to ZooKeeper?

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yes, particularly between PrepRP and FinalRP. See https://issues.apache.org/jira/browse/ZOOKEEPER-1092^{Image Removed}