I stumbled again over a question from 2012: http://www.question2answer.org/qa/19535/event-module-not-listening
Gidgreen mentioned the override of qa_page_q_post_rules(), and that we should also call qa_page_q_post_rules_base().
I have found a plugin of NoahY that does this: https://github.com/NoahY/q2a-expert-questions/blob/master/qa-expert-overrides.php - also with other functions.
As I could not find any specified function for qa_page_q_post_rules_base() I assume that you can override all functions by adding _base.
ouch ... myself ... RTFM: http://www.question2answer.org/overrides.php
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