Implement Footer Callback to Display Calculations in the footer

I would like to see if any one can produce a patch to provide option on the configuration form ( where it has options to select if the field is sortable ) to also allow a field to display sum or count in the footer for that particular field.

Then where the view is rendered, display page sum (Total sum) , just as it is displayed on the example site. I was able to do this outside of drupal with the initialization code provided however in the module :

This would require interception in the script initialization code and generate the script dynamically depending on what fields are selected to perform calculations.

For reference to exact functionality, checkout http://www.datatables.net/examples/advanced_init/footer_callback.html