I need to translate the name of the languages appears "CATALAN" but must be "CATAlÀ" and also appears "SPANISH" amb must be "ESPAÑOL".

at the moment there is only subtotal, but merchants need an ability to use discounted subtotal as a base.

This is a very common feature found on most shopping carts and considering many customers shop by brand and filter from there, I'm not sure why x-cart doesn't include product filters on brand pages aka. /?target=brands - it looks like there was room left for them on the left navigation, so maybe it was forgotten or not completed for some reason?

In business wise, reports are very important ! Admin should be able to print or export reports like : sales/costing, customers/members, provider/vendor commissioning, VAT/GST for specific period, bonus points used/balance for each customers, profit/loss, balance stock/inventory and etc.

integration with http://www.edostavka.ru/clients/integrator.html
the most famos delivery company in Russian Federation

When administrator receives notification about placed order there is a customer email listed. However it is impossible to reply to particular customer right from this notification. You have to copy customer email and write a new mail to him.

There would never be a situation when an order notice would be replied to the the store address itself. However, it is common - even normal - to reply to a customer. "Thanks for your order. We are out of green - would Teal meet your needs?"

When customer emails via contact form, instead of "Enquiry" etc. Put "Subject line"

ie. mine is received as company name.com: Enquiry.

This could be "Help with my order 203924 - company name.com"

the option to give an expiration date to a product, valuable for end-of-life products, at a certain date the products is no more available, biil did it for me, an hour long job.

VISA Checkout implement PCI compliant credit card wallet for shoppers. Using this feature shoppers can easily access their credit cards stored in VISA Checkout and pay for products sold using X-Cart.

Prompt with a warning when the slider that closes the storefront is clicked, "Do you really want to close your storefront?"

(She meant to click "View storefront"! Really!)

The VeriFone MX880 CC machine (like the ones at Wal-Mart) are feature rich and ready for media support of a properly built interface. None of the CC processors that have low fees support the Xcart interfaces AND a proper counter top cc machine. Can't really talk about hassle free True integration until my brick and mortar customers can pay as easily as my online customers. Seems to me that a CC interface to the computer that passes the swipe or Chip Check. DEBIT is a must to keep fees down.

Membership icons. For example if you create a special membership which can have free delivery, discounts, show special products. When a customer is part of this membership, it could display an icon in the product page or header that the customer is now logged in, or viewing a paid membership version.

The 4.X branch of "Advanced Customer Reviews" had "Advantages" and "Disadvantages" fields, this 5.x version does not. Please add them back.

it would be cool if an administrator can do their store management tasks using iphone/ipad or android device via web-based control panel..

this can be implemented with Jquery Mobile framework (jquerymobile.com)