These two fields allow to specify a different default assignee for ticket opened against this package in bugzilla. Note: The EPEL field is always displayed for packages in the 'rpms' namespace regardless of whether it is used in bugzilla or not.
It is rare, but there are times where you want to swap out the currently compiling file for a different one. This Perl module does that. From the point you use the module perl will be parsing the new file instead of the original.