Go for WordPress. It has great API. Allows to develop anything you want. Developers and community are dedicatedly involved and regularly update it. So only 0.000000001% chance to come into the situation what Q2A is suffering.
Also, I would like to give suggestion to everyone who is running Q2A script for serious business. Just move to any other software (I recommend WordPress) before you get a big jerk in your business. I have lost hope for Q2A and gradually going to discontinue all my products.
Where leaders do not so much concern then, community cannot do anything than just finding a better alternative.