http network test

I've got a few instances of

     a.b.c.d   www.server.com     # http://www.server.com/

and the http column shows up just fine,  including the time the test took
and a nice graph.

The question I was just asked is, is it possible to specify "max response
time", so that if the time shown is greater than N seconds I get a red
flag??  I don't see a way to set that in the man pages for either bb-hosts
or hobbit-client.cfg.

Thanks,

Ralph Mitchell