Great Nehal, i had been trying to find that answer before. I have tried your suggestion on the "stock.move.tree" for the Delivery Orders product trew view, it works and accomplishes what I wanted somehow, but now I get an error when I try to add a new item to the Delivery Order: 

Error: Could not get field with name 'product_id' for onchange 'onchange_quantity(product_id, product_qty, product_uom, product_uos)'

Any idea why I get that?

Also, with the solution you provided the Stock Move Form is not availible anymore for the move lines (same as with Invoice lines)....do you know if it's possible to have a "hybrid" solution, making the lines in tree view editable and at the same time be able to open the move line form?