Answer to: To replace battery on keyboardIt's not about litigiousness, there's a real risk. There's a lot of energy in lithium batteries, and although the ml-2032 looks the same as the more common and cheap cr-2032, it's harder to find and there's a real risk.
Answer to: Why is my HP Laser Jet 4+ crinkling up paper and jammingCheck the paper path to see if there is some paper or other object jammed in there. In addition, the rubber rollers that push the paper along do eventually shrink slightly and harden. A kit to replace them is typically about $20.