MadMonkey: I agree a "Mini Boss" would be nice - currently I know of a few fellowships who have "temp" BIG BOSSes because they are unable to be on for awhile - a Mini Boss would be a great solution for situations like that.
As a side note, if a fellowship has a BIG BOSS which is no longer on the site, I'm pretty sure that if the current members of that fellowship would like to keep it going with a new BIG BOSS, Fencer could make the switch for you. (Then again he might not - this is just a guess.)