That's easy enough to do, but that is not how things worked under 6.4.2 and the "back button" functionality is important.
Another data point from one of my customers. Same problem in a different situation:
i just typed out the longest most correct mathematical post in a long time and i hit continue and got an error message that said "this form is no longer valid, please use your browser's back button" i then had to hit the [censored] BACK BUTTON and it erased all my work.
