Haven't coordinated a league in a while, but here are two minor tweaks I think could make certain tasks much easier:
1) Allow coordinators to re-order (or delete) fields in registration exports. It would be especially useful if the order/list could be saved for future exports. Alternatively, it would be useful to change what fields are visible when viewing registrations on the site, but because only a few fields can be displayed, the first option would be much more useful.
2) The "Email Lists" section (under Admin) seems pretty useful, but am I mistaken in thinking there is no one-click way of emailing those aliases? Seems I can only view users, edit the alias, or delete it.
P.S. Is this still the right list to use, now that you are Ultimate Central?