As a developer i would love the ability to add additional users with ability to turn on and off functionality.
So i can create a new user for my client and not them tamper with css, and hide the widget codes fro them as an example.

It would be good to make it possible to edit the invalid orders from the control panel. Customers often fill the order form with errors that may affect the value of the order and time of its execution. And no big corrections administrator, would reduce this impact to a minimum.
You can of course delete the order and ask to legalize it again, but I do not think this is a sure way out of the situation. Thanks in advance for your support.

The ability to have multiple websites/stores and manage all of them through your account. Also to have the ability to choose which products show in each store. We would also need the ability to see the sales per store and invoice on that as well.

One button to backup everything that is connected to the user profile, like products, customers, dashboard and settings.

Enable shop owners to define more product characteristics - eg internal notes, stock location, dimensions, - or have custom spare fields that the owner can include on products. NB this isn't product options - it's about core product definition and stock management.

Per product/category sales, daily/monthly/quarterly sales, sales per referrer

anything else?

In my.ecwyd accourt, I can print invoice for each orders. But, with my iPad, this fonction dont work. With my Mac, I print to pdf, for backup each invoices. Can you add this fonction 'save on pdf'

As a visual person, I find it most helpful to identify an item in inventory by a small photo instead of searching through item headings. Would like to see option to include thumbnail with info on the catalog/products page as it would be a huge timesaver for us.

price and quantity could be updated in the product list. also the product status could be switched from there.

in the control panel in the customer section all u get is name and email. would be useful to know the customer address.

I can use the same image for different sizes of my product. It would be easier if I could upload all my images and then associate them to products as needed.

When looking at an order we can print an invoice but it contains pricing information. It would be nice if we could print a packing slip, which would only contain items skus, description, and quantities. This way, we could e-mail these to drop shippers to handle the orders.

There should ba an iPad app for he control panel so that we don't need to use the browser, where we can't upload images.

Be a lot easier managing inventory through an app on the go

Just add a field to store a barcode number in product database and few pages to place, query and modify a sale.will be saved together with those obtained on the web, coded properly.

Since our company has different folks specializing in different aspects of a product listing (copywriting, photography, product info, shipping details, etc), it would be a huge help if we could leave notes under listings that might need someone's additional attention. These notes would not be part of listing but serve as an internal bulletin board and serve to get those listings disabled due to missing info or in need of another photo taken care of and moved to active status. Perhaps more importantly, person in charge of sales could note customer shipping preferences or other details as well.

To be able to select the interface language for the control panel and to customize it (colors, logo) that would so great !!!

Adding ability to ship from multiple warehouses. This could include within the same country or in a different country. Shipping is determined based on the best price available to ship to that customer. The system would also benefit from if items are out of stock it shows 'out of stock' from that warehouse but still showcases the international shipping or more expensive option so the customer can decide on whether to wait for more in stock or get it shipped through the other warehouse.