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I'm not sure what you mean by duplicate registration. You can configure KonaKart to allow a customer to checkout without registration. You can also configure KonaKart to allow a registered customer to checkout without signing in although in this case he / she won't see the order in the order history. This second feature was added in version 8.8.0.0 . Here are some details https://www.konakart.com/javadoc/server/com/konakart/app/CustomerRegistration.html#setAllowMultipleRegistrations(boolean)

You can easily achieve this by creating an action class that adds the product to the cart and then redirects to the checkout confirmation page.

If you are connecting to the KonaKart engine from a Java program running in the same application server webapp, then I would use the POJO APIs.

If you are connecting to the KonaKart engine from a Java program running on another server or a different webapp of the same server, then I would use the JSON APIs, which are almost as fast. You don't actually have to construct the JSON because you can make Java calls to com.konakart.json.KKJSONEng (which adheres to the same interface as com.konakart.app.KKEng) and the JSON plumbing is looked after for you.

If you are communicating using a JavaScript application then we have a JavaScript library called jquery.konakart-x.x.x.x.js that converts our standard API calls into JSON messages and sends them to the KonaKart engine over AJAX.

We also have facilitators to simplify the task of connecting to KonaKart using a .Net application using the JSON APIs.

For any other technology I would also recommend JSON.

Depending on the promotion being used, KonaKart allows you to define how the attributes of the promotion are interpreted. You need to take a look at custom\modules\src\com\konakartadmin\modules\ordertotal\totaldiscount\TotalDiscount.java to see how the custom attributes of the promotion object are mapped.

e.g. Minimum Order Value is mapped onto custom1

Not really. As I said you need to do some work to see where the time is being spent. I'd start by seeing how long the DB is taking to return the data.

You pass an array of description objects. One for each language.

I would analyze whats taking up the time. i.e. Database, code or transmission of results.

You can use the KKAdminIf API call, editProductWithOptions().

You already have everything you need. You have the source code of the standard JSP based storefront where that functionality is present and you have the source code + documentation of all of the tiles so what you need to do is to make a JavaScript tile that replicates the functionality of that language drop list. If you can't figure it out then you may want to consider getting help directly from KonaKart or one of our partners.   

It looks like you are using the EE version of KonaKart so you have the source code for all of the tiles. What I would do is to just create a new tile (following the examples that you have) that shows the language drop list and manages the language change.

It's just a drop list and should already be in TopBar.jsp.

Yes, you can set it by code.

Add all of the coupons to the coupon code attribute of the order separated by commas.

It's for versions  v 6.6.0.0 - v 8.5.0.2 .

The latest version (8.7.x.x) contains the patch.

A patch was made available on 9th March: https://www.konakart.com/downloads/patch-releases/