Solutions feedback spam

Our portal started getting thousands of spam Support feedback submissions per hour. I was able to set up filters to mark the incoming tickets as spam, but couldn't stop the flood of "you have been added as a watcher" emails. Ultimately we had to require a login for the Solutions page, which makes it drastically less useful.

Disabling the feedback as described in doesn't help, as it makes the form invisible to humans but still usable by bots.

Could any of the following be implemented to mitigate this problem?

* a CAPTCHA on the article feedback form
* an option to fully remove the feedback form rather than hide it
* an option to disable the "you have been added as a watcher" emails


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