Is there a way to change a Group Owner?

We will be using Groups in a different way, Groups will be predefined and can only be created by Site Admins, if there are needs to create more. The Groups will NOT be managed by the Site Admins instead by an ordinary users. Since Site Admins are not going to be the Leader of the Group I'm wondering:

1. is there is a way to set a Member to become the Owner.
   
2. as a Site Admin (Super User) do I have an automatic Administrative capabilities to any Group? I mean a member or not of any Groups, will I have the capabilities of what a Group Owner or Admin have.
   
3. if there is no feature to change a member to owner, where in the table can I change this setting?
   
4. I suggest this feature will be added to Groups in the future.
   

Thanks!