Description of problem: This is a request for enhancement. Since libvirt 0.4.5 specifying a domain name to be used by dnsmasq is supported. Since libvirt 0.9.3 specifying dns configuration info for a virtual network DNS server is supported. Please to the connection details/virtual networks GUI to support (optional) specification of the libvirt supported additions. Yes, you can manually edit the network definition/configuration files but it would be far easier (and save time) if the gui supported this. Version-Release number of selected component (if applicable): Fedora 17+
Since this is a feature request, moving to the upstream tracker
Gene added this upstream, closing.