Well, you gotta have what it takes to live with a JRT. Thanks for the reality check, guys, but I was hoping to find someone who actually has reached new frontiers with his/her dog. As far as JRT are concern, Iggy is much more tempered than most of them (I had another one which was on the turbo boost most of the day), though he has is moments.
What I was thinking of was to use the intensity to search, and the obedience to just wait for me. I'm not convinced it is that crazy of an idea. This a dog that can heel on the street with me without a leash and will stay there no matter what goes around: squirrels, cats. When temptation seems too strong, a firm "hey", and he's back on track. So, I don't think it is impossible, but I would to hear from someone who got close to that.