Brian, great ideas. But, as you say, what good is an allergy from a year ago. But, what good is a weight from a year ago. As someone who has probably moved the damned prescription writer at least 15,000 times to see the weight, I have always wanted it there too. But, we would need to make sure the weight there was accurate. Even if it were dated somehow, you may overlook that it is five months ago IF it were coveniently located on the script writer.
Having the script writer populate the allergies is a GREAT idea.