Can I make reports export the state/province abbreviation instead of full name?
Take a look at the "Contributions by Organization Report".  CRM/Report/Form/Contribute/OrganizationSummary.php and the line:

$rows[$rowNum]['civicrm_address_state_province_id'] = CRM_Core_PseudoConstant::stateProvinceAbbreviation($value, FALSE);