I agree that the documentation leaves a mixed impression, like read, like to understand how the class works, but that's where his stick, though the name of the file wrote for example in the code examples...
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Now (right now :) ) the debugger climb through the code and see where I need to implement carefully. Thus, in particular, the night found that the initialization of the routing is logical to insert it in the bootstrap using the _init* (and the funny thing is, when found, I already found the option to Google, but again on other sites).
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In General, I agree with the opinion that ZF is more of a pile of bricks than a building which needs only to finish, but because I am glad that my main symfony (now the second master), which can be easily used "bricks" of ZF, instead of inventing a Bicycle, but have well-documented the actual building :)