Hi Chris, I asked the same questions once about my Stump's smoker. During the winter, with a Guru or Stoker type temp controller I can keep my pit as low as 150 deg. Ramping through the temp stages of sausage making would be difficult, impossible in the summer. Like Dave said you could cold smoke in your lang and finish off in the oven or poach. Maintaining the low temps in a Lang ,IMO, would be tough.
I finally broke down and got a dedicated sausage smoker. I found a bread proofer at a used restaurant supply. Works awesome, and cheaper than a commercial brand smoker. A lot of guys do sausage in BBQ's so it can be done. You just have to be really involved in the process. You could try a hot plate with a pan of chips in the fire box. Just saying........:icon_confused: Good luck, Marty