Just a couple of small buglets maybe (or perhaps I'm missing something?) ...

1. If you add a new product (using 'copy x1') on the QU page, the empty product appears on the QU page, and can be edited, but the product name isn't saved when you 'update' (the product name field is blank after update).

2. The newly-entered product doesn't appear under any category in admin->catalog->categories/products, although it now shows up on the drop-down products 'copy' list on the QU page and is in the database.

3. If you hover your cursor over the 'edit' icon at the end of the newly-entered product line (after a 'copy x1'), the path is missing the 'product' in 'admin/product.php?cpath=...' - ie. it looks like 'admin/.php?cpath=...'

4. If you click the edit icon (as above) on another product (that has been previously entered the normal way through admin) the edit now doesn't work (page isn't found) - the path shown is:

PHP Code:
... /admin/product.php?cpath=0&product_type=1&piD=123&action=new_product 
The edit icon only doesn't work just after you've used the 'copy x1' and the 'copy' button becomes visible on the QU page header.

If you log out and clear your cookies/cache then login to admin again (so there's no 'Copy' button in the QU page header) then the edit icons work fine again.