Event modules are useful only to a point... what would be really useful is Wordpress-style hooks that give us the data before it is processed. Most obvious would be a posting hook that lets the plugin process the question/answer/comment first, edit it and alternatively decide whether or not to submit it.
Yes, this would be possible using a 'filter' module type or something similar. Be sure to put in a request for it when I'm collecting suggestions for Q2A 1.5!
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July 15, 2020: Q2A 1.8.5 released!