you're going to need a damn good reason before they give you a transplant :o) your pancreas does a lot more than just produce insulin. it digests fats, spits out hormones.... does a lot for daily living not related to insulin.
pancreas transplants are one of the hardest because of all the numerous functions it performs. it is very easily (and commonly) rejected. i "know" someone (she was the wife of my middle school library teacher) who had a pancreas transplant and it didn't go well for her. she passed away shortly after the surgery. that's also why pancreatic cancer only has a 5% survival rate. the pancreas truly affects EVERYTHING.
there is also the problem with the fact that diabetes is an autoimmune disorder and not just a faulty pancreas. after you have a transplant, how do you keep your immune system from attacking it again? in studies i have read, many people with pancreas transplants (who had t1 before) developed t1 again within 10-20 years after the transplant. if they can shut off the immune system reaction (which they try to do via steroids and anti-rejection meds), they could [potentially] cure diabetes.
in short, it's dangerous and not recommended unless there is no other course of action. for me, i can handle diabetes. i'd rather have a semi-functional pancreas than one that only "might" work. :o)