I am using this very module on PokerDIY and it is great.
However, I lock down posting by unverified users (spammers) by using the old AS 2-phase verification - this requires users to validate their email before they can post and uses a Verified Role. Therefore, all modules that allow content posting (forums/games etc.) are only Editable (ie. add content) by the Verified Role, not by Registered Users.
However, I can't figure out a way of doing this with the DNN Q&A module - within 1 day of going live a spammer started posting:
How do I restrict the module to only allow a certain Role to ask Questions?