More product variants to combine and add exceptions. Like.
Model shirt will only shows sizes and colors for that typical shirt.
Example:
A regular t-shirts has 38 colours and a baseball shirt just 4 colours.
When customer select a model then the combined product variant will show only the colours for that shirt.

Ability to specify product brands/manufacturers/vendors. Customers then can navigate the catalog by brands

Export products to "Google Product Search" (ex-Froogle):
http://www.google.com/intl/en_us/products/submit.html

Add the ability for customer to attach some file to product when buying. The attached file should be saved in the customer order.

Store could be Full Ajax enabled, means Buyers could Visit whole store without Reloading Pages.That could save many time for low speed internet connection shopper/user.

I think, PIN Numbers and Software Keys to product is good Idea. Admin can upload PIN Numbers and Software Keys though admin area to each product. User can upload via csv, text or manually to products and products quantity should update automatically with number of keys. When user purchase one, then key should send in email and mark it sold in database.

Using a stock product, the user can sell similar new/used product that is listed in the same stock product.
Each user can enter additional description and images.

Quite useful and expected feature for coming soon and pre-ordering products

Display "Select option..." and require customers to choose an option from the field (if it is a required one), or leave it as is (if it is an optional one)

I found a tool (ProActive eCommerce Client) to send real-time ads to customers or redirect them to special products. Really useful.

1. Providers and admin will be able to create warehouse and set information on profile modify page with specific attributes (Warehouse name, email, contact person, phone and so on)
2. When creating a product it will be assigned to some warehouse.
3. Shipping cost on checkout will be calculated as sum of shipping cost of each warehouse basing on warehouse address or warehouse shipping rates (based on defined shipping methods).
4. When order is placed into the store, it will be divided on sub-orders (One sub-order for each provider that products were ordered).

in LC 2.2 you can't easily individually reference the product extra field data to make them part of the search results, category pages or product pages.

need the ability to change the filesystem pointer(s) in the admin zone for a product to its images (thumbnail, larger images etc) without having to re-import product. LC 2.2 allows you to specify a product file to upload to the filesystem for a product but it renames the image file when it puts it on the server. Adding the ability to point the product to an image file on the server would be huge. The only way to do this in LC2.2 is by re-importing the product.

Ability to add multiple products at once by displaying the admin a table of input fields where columns are product fields

1. Admin sees a list of low-stock and out-of-stock products
2. Admin creates and prints purchase orders for these products, the system displays the ordered product quantities in the list of low-stock products
3. Admin sends purchase orders to suppliers by email or post
4. When a supplier delivers products, the system marks a purchase order to him as "resolved" and removes the ordered quantities form the list

Inventory tracking with serial numbers/lot numbers for kit items etc. Currently, we're using SBF for inventory control software and would like to have same features

The clone should take the SKU which is next to last available. For example if the last product I created was SKU112, the cloned product SKU would be SKU113.