limit-votes-by-role.php

add_filter( 'jck_sfr_votes_limit', 'jck_sfr_votes_limit', 10, 2 );

/**
 * Limit votes by role.
 *
 * @param int          $limit
 * @param JCK_SFR_User $user_votes
 *
 * @return int
 */
function jck_sfr_votes_limit( $limit, $user_votes ) {
	$user = wp_get_current_user();

	if ( in_array( 'author', (array) $user->roles, true ) ) {
		return 2;
	}

	return $limit;
}