I was working on a Behavior for which I had to listen to the Controller::render() method to be called. Even more, I had to distinguish between the type of render method called. Unfortunately, the Controller class only offers two events: EVENT_BEFORE_ACTION and EVENT_AFTER_ACTION. It would be nice if this list at least were extended with:
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EVENT_BEFORE_RENDER
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EVENT_BEFORE_RENDER_FILE
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EVENT_BEFORE_RENDER_PARTIAL
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EVENT_BEFORE_RENDER_AJAX
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EVENT_AFTER_RENDER
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EVENT_AFTER_RENDER_FILE
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EVENT_AFTER_RENDER_PARTIAL
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EVENT_AFTER_RENDER_AJAX
I know it is not likely new features will be added to current 2.0.0beta, but this is a minor adjustment with no disadvantages or compatibility issues. It would help me greatly, because I don’t want my components to extend from custom components, but I prefer the default components instead. 
If anyone else is missing events, feel free to complement my list.