See my responses to your questions below...
In hindsight we realize that the tutorial probably caused more trouble than good. This was released in the hopes that it would accommodate for those that we could not provide support to. We realize the existence of the tutorial can confuse users into believing we will assist in making those changes so to avoid this confusion any further, the tutorial will be removed.
Since you will be using eCart to make a change to the eCart behaviors in PowerStore, we will absolutely support you. It is hand coding and custom changes that will not be supported. We will even support you in using eCart to change the currency symbol and currency format on the checkout pages, but that won't change the symbols on the other PowerStore pages.
For that exact reason we provide the feature list and demo of our solutions. We cannot list all the features that do not exist in the product, and we do not want to deter developers who are capable of making these types of customizations from taking advantage of this product. You can see in the demo that there are not any settings for changing currency.
Glad to hear it. We try to accommodate for as many customers as possible, but with the number of products that we are working on, we cannot always create a product that does everything anyone wants it to do.
With that said, please send any additional comments/question regarding this policy to our feedback form: submit-idea.php.