Create a facebook App that woud export selected inventory to a Facebook store page.

Addon which helps to generate business proposals just selecting which products (and/or product folders) to include. Next step is to add a Title, header, signature and "Generate PDF" button. This helps to respond flexibly to any potential customer needs sending a good looking specially-for-him made business proposal with only those products included he is interested in.
This a must-have tool in telemarketing and other sales activities with individual approach to the customer.
This addon could be easily derived from Pricelist addon (adding a feature of selecting products/product groups)

If I set A related to B, auto-set B related to A. This will save a lot of time.

I would like to be able to split test changes using google website optimizer. It is really important to bring up conversion rates.

It would be nice to have a birthday reminder. On customer birthday, System send an email automatically and create a one time discount coupon. The email template can be set and choose.

Enable CS-Cart to manage sponsorship for visitors.

For example, if i invite one of my friend to the website i can get rewards like points or gift voucher.

100% of our customers (we're an agency) asks for this.

For instance, if orders over $100 get free shipping and the customer has $80 of product in his cart, the additional amount needed ($20) to qualify for free shipping is displayed.

See this thread for more information:
http://forum.cs-cart.com/showthread.php?t=14697

Please visit this link to see the benefits of WIDGET FEATURES
http://www.shop-script.com/features/widgets.html

Allow a user to email the contents of his cart to one or more people. I use this feature all the times on sites like Newegg when somone wants me to configure up a PC for them.

Allow customers to 'subscribe' to tangable products. This is great for consumables that need to be 'topped up' on a regular basis.

This could include, vitamins, cosmetics, sports supplements, beauty products etc

We could discount a product if it is 'subscribed to' and allow the customer to define how often to reship.

Weekly, Monthly, bi-monthly, quarterly and so forth.

This allows repeat business without the user having to make any input on an ongoing basis.

The customer can cancel the sub in their account login.

These features are must to track the customers' behaviors and to understand how effective our marketing tools are.Easy for integration too.
1.Field for "google adwords feedback code"
,2. Field for "google analytics code(ssl open,close)"
3. Field for "google verify code"

Like 'related products', it I add product B to buy together with product A, When I view product A , I see the combination of products A-B.
Cs-cart should auto set that when I view product B, I will also see product B-A 'buy together'

Create an option to create private sale events with event countdown timer, email announcements, option to restrict to members or make public. This is similar to gilt.com , ruelala.com magento has this in their Enterprise version as well.

It would be nice if we could email customers with abandoned carts after x number of days. It's kind of creepy, but it may also increase sales. Eddie Bauer does this.

See this forums thread for details:
http://forum.cs-cart.com/showthread.php?t=20295

This is very usefull for follow-up customer who has not been payed as for reminder to pay by scedule time from placing order. if not paying yet then status invoce change to failed/cancel.

The ability to search for specific Coupon Names in the sales report criteria and/or the ability to create a report.

This allows the store administrator to evaluate the success of a specific coupon code/campaign.

Exporting to CSV should have the option to export "Displayed Price" that reflects the default value of product options.

This is relative to exports to Google Merchant Center where the price is not an accurate reflection of product options that are required. Advised to include the same functionality into any additional modules.