Here is the link to the free Order Edit by itw_davies as released on page 2 of this topic (here):
Below is the original Topic Start:
I'm almost done with Order Edit Module.
It allows to add new product, edit quantity, prices and also to add discounts for total amount.
For best understanding:
user / pass: demo
*this mod its 90% ready
To see the whole screen http://www.msolutions.ro/oc/ei.jpg