Old sales orders with backorders cancellation

Would be cool to be able to cancel the rest of an existing sales order with a click of a button that has had partial shipments already, instead of having to manually edit the sales order and delete the lines and qty so that the sales order won't show up in the pending sales anymore.

For instance if had an old sales order that's sitting there with backorders that I will never fill cause i'm not reordering the stuff, i'd like to just cancel the rest of the sales order.