1. When you are going to roast a chicken, Cook it for ten minutes is your pressure cooker, then take it out and pop it in the oven. Takes less time to cook and tastes great.
2. Smoking, get a piece of aluminum foil and put a teabag and some sawdust in it, place it in your pressure cooker on the bottom. Put your meat or fish on a rack and bring the cooker up to pressure. Cooking time will vary on degree of smokyness you like, so experiment.
3. Be very careful when cooking pulses as they foam and can clog the vent resulting in Richard Bridges scenario in the first post.