I don't think memebers who aren't leader can promote to leader unless that leader hasn't been on in a set amount of time, then leadership reverts to the rank below. I think that's how it works. I have promotion ability I'm my FC but I can't promote myself to leader (not that I've tried of course ;D)

Points 1 and 2 are great ideas, especially 1 since this comes up quite a lot in my FC. Mail is also something that would be great. Personally I'd like to be able to separate garden plots and allow separate rank abilities for each. I know it's a small thing but it would help greatly.