Probably impossible to implement. If not impossible, then a pain in the ass for something trivial.
Also, I personally wouldn't like expanding the officer spots because just think of it as folks getting jobs. There are only so many spaces to fill at a job. But there will be at least 2-3 who didn't quite make the cut. For those 2-3, sucks to be them. But if they are really good players, they will still be an outstanding member of the family. If they QQ about not getting a position (and I have had this happen in my faction before, folks QQing because someone got promoted and they didn't), then they were only in it for the power and I wouldn't promote them anyways.