Unfortunately not. Once an order is created, it is pretty much set in stone. You may have noticed with the Edit Orders module that unfortuantely this doesn't always work perfectly with certain modules and Order Total modules, and creates some suprising results.

If you wanted to create this module for your own site, you would need to consider all order totals, coupons, group discounts etc. Which in essence means that the order needs to be built from the database records, editted, and then stored back into the database, correcting the records as it goes.

As with anything in Zen, it is possible. This particular mod would however be a fairly major undertaking.

Absolute