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These all require authors! :) Please consider contributing to our tutorial.
If you must use one of these widgets that are undocumented, I strongly suggest you take a look at the *.c files in the PyGTK distribution. PyGTK's method names are very descriptive. Once you have an understanding of how things work, it's not difficult to figure out how to use a widget simply by looking at its method definitions. This, along with a few examples from others' code, and it should be no problem.
When you do come to understand all the methods of a new undocumented widget, please consider writing a tutorial on it so others may benefit from your time.