How to switch the Q&A plugin from auto post to post upon approval?

Generally until recently I didn't mind people posting questions and answers without my approval, but recently two things have changed this. 1) Someone has realized that no approval is required and is spamming with advertisements. 2) I have people who like to answer questions, but refuse to because the filter only allows what seems like one answer per day per IP.

Does anyone know of a way to change the code, or additional plugin, that will make the switch from auto post to post upon approval?

Many thanks,