This isn't really an answer, but just as some background. In the past plugins for Atlassian products have tended to be specific to a particular purpose, like the HipChat plugin sending specific messages (ie issues created). The main reason is that our ecosystem has largely been Java based, for obvious reasons, and there isn't really anything you can't do in a plugin. Assuming you know Java of course...
What might interest you for the future is Atlassian Connect, formally known as 'Plugins 3'. This allows non-java plugins to interact with our products.
The bad news is that because this is primarly targetting Atlassian OnDemand there isn't any immediate plans to integrate this with Stash. In the short term you may need to develop your own plugin which does what you need, either by sending all events to Hubot, or writing a custom Java plugin.
Sorry I don't have a better answer for you.
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