How to stop spam with Q and A plugin

Hi there!

I bought and installed the Q&A plugin.
It works allright and it's a nice idea, but spammers are making it impossible to manage in my website.

I have to invest too much time "deleting" 99% of the questions (garbage, numbers, links and xxx words).

For example, Intense debate makes a great filtering of the "normal" comments. Is there a way to stop spammers in Q&A?

I mean common filters like words, IP detection, urls in questions, etc.

Otherwise I will have to uninstall the plugin and forget the idea of questions for the site...

[I marked the option to review before publishing, but it's unusable at this spam rate... ]

Thanks for the help!