BIND does not support multiple questions in a single query. :\ Based on draft-ietf-dnsext-edns1-03.txt
Multiple queries in a question section have not been supported in DNS due the applicability of some DNS Message Header flags (such as AA) and of the RCODE field only to a single QNAME, QTYPE, and QCLASS. edns1 tried to change the tradition, but it then died (with other proposed changes).
