I am hoping to find a way to disable the "reference insertion behavior" of
the PageUp and PageDown keys when editing text cells in Excel.

To phrase it differently, if you are editing data in a cell in Excel, and
then forget to hit enter or tab to exit the cell and commit the changes
before pressing PageUp or PageDown, not only do you lose your changes but you
also lose your orignal text if you don't notice that this has happened before
the undo command becomes unusable.

Does anyone know of a way to alter this behavior? at the very lest for
columns of data that are of type "text"?

Thanks.