I don't try to cook the sausage in the smoker, the concept is just to 1, dry the casing in the smoker, 2, smoke the sausage. Whenever you feel the sausage has enough smoke, start boiling your pot (I use a big crab pot to cook 5 pounds at once). Then when boiling, pull your sausage from the smoker and place in the boiling water. Let boil maybe a couple minutes (water will probably stop boiling when you place 5 pounds of cooler sausage in the water). Then turn off the heat and let cook in the water for an additional 5 minutes or so.
The direct answer: yes I am not concerned about the internal temp at all.
Caveat: I have been using hot dog diameter casing. For the 32mm+ casing, I would probably increase the time in the water a bit.