Membership 2 New USer Admin Approval

I have just installed this plugin. Up to now I have custom coded this sort of functionality but I like the way Membership 2 seems to work. the only issue I have at this point is that My client will need to approve membership applications. I don’t see any way to set it to require approval. Is this possible? If not, is there a straight forward way for me to code this in? API etc.?