This permission will be part of the upcoming UC_Signup release and is necessary to allow one user to sign up on behalf of multiple other users. I suspect if this isn't granted by default, some site builders will unknowingly leave it off and miss out on this valuable feature/benefit.
Comments
Comment #1
ezra-g commentedComment #2
ezra-g commentedI also granted "administer uc_signup" to the new attendee manager role.
http://drupalcode.org/project/cod_support.git/commit/2fe467a