Great pr0n and info already! Here is how I cook the STL trimmings. I slice them about 3/4 thick perpendicular to the cartilage. Then, I rub them just like ribs and let them sit until they start to sweat which is usually about a 1/2 hour.
Once they are ready, I put them in the smoker at 275 degrees F and cook them for about 1 hour. Then, I wrap them in foil with a little liquid like AJ and let them cook another 2 hours and then I check them for tenderness. If they are tender I pull them out of the cooker. If not, I let them cook another 30 minutes and check them again. I repeat the process until they are at the tenderness I like.
I foil them pretty fast because they have a tendency to dry out. This method has always resulted in tender juicy rib tips.