Feature request: shorter timeout resolving

[sysnaz]

I am using netdns2 in order to monitor a local bind9 dns server. In normal conditions, asking for a local name resolution, I get a response within 1 ms, so after say 50 ms, the response will not come because most likely, the DNS server is not working.
I would like make quickly the service swap to another dns server, but at the moment, the smallest timeout is 1 second.