There is another issue that needs to be solved before we talk about bringing another mod in and that is the community needs to define what it wants this site to be and how it wants to handle moderation on topics like close/open policy on vague questions and what constitutes an answer for an identification.
Currently, there's not a lot to be moderated on the site and the only thing that makes it difficult is it's not obvious what the community as a whole wants. This makes it very difficult to moderate to content we have. I personally tend not to close or delete questions and answers any more as it has caused several problems in the past.
If I were just a regular member, there's a lot of questions I would flag for close with problems in. As a mod I really can't due to flags being binding. I think in general we would benefit from closing and flagging borderline content sooner to try and keep our quality high, but we also have the community in general active enough in moderation to also handle the reopening of questions when the content has been adjusted.