I myself have turned off the "All-In" button for reasons exactly the same as Texas72's. Unfortunately my story doesn't have a happy ending
I ended up hitting by mistake and going all in with my 94os. Lucky for me
somebody had KK and called. I lost.
I was in something like 9th place at the time with about 30 people remaining. The guy that called was the chip leader......very frustrating as I was in great position to take a run at a win.
I have since been alerted of the option to get rid of that button, and have done so. Don't want that to happen again