Automatic sorting of Purchase Invoice items

Hi, this problem seems to have returned. Now it is re-ordering items after the first save/view and then after correcting they seem to stay OK.
Also, would the option of dragging to re-order be possible? It would save re-writing lines and, would the option of having quantities on purchase invoices be possible as this is available on POs but is lost when converting to a purchase invoice?
Sorry for the 3 in 1.
Cheers