[Black_rain13]

Here's my two-cents worth of input.

If you are gonna set it up, you would almost have to make it so the Leader/Founder of the crew can elect how much authority to give the co-leader at any given time. I may not want my co-leader to have challenge issue/accept powers, but may want him to be able to kick other members. I certainly don't want him/her to be able to invite members though, unless for some reason at that moment, I want him/her to be able to do so.

This opens up a whole nother can of "Wonder" because you are talking about customizing the access for co-leaders and every crew leader may want to use, or exclude other options.