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On Fri, 14 Dec 2012, John Doty wrote:

> It seems to me than when a human or script draws a conductive object it should know ahead of time what the network affinity of the object is.

It is not true and I've already written a counter-example (obstacle, 
bridge) in this thread, please read back. What is true is: one of the 
possible strategies of laying out a PCB is the incremental way (expanding 
traces at the ends until reaching their goal). There are other ways 
which are more efficient in some cases, and some of those operate with 
creating floating copper in advance, disconnecting existing copper areas, 
reconnecting them to different networks, etc. This why a simple 
first-touch would not work unless you restricted the user to only one 
method of proceeding with the layout.