This is a great point. We can add this setting to control product status based on product or/and options stock level.

Sound good?

AbanteCart is on github now. Feel free to contribute.
https://github.com/abantecart/abantecart-src

Unfortunately, we do not have this feature yet. Frankly, this would be very good extension and it should not be difficult to develop.

We will consider it, sometime in the future, if nobody develops it. 

We apologize for the delay. 1.0.3 will be out tomorrow. Working on the upgrade package and release notes.

Sure. You can provide documentation.

There is no way currently to get quantity for the product. This was hidden for storefront users. There was a concern with unwanted requests for product quantity.

This can be added as easy as creating new controller quantity.php with access to product model.

public_html/storefront/controller/api/product/quantity.php

Thank you for suggestion. We will note this.

There is a concern that regular catalog pages might have NON-SSL inclusions and this will cause warnings to poup if you have SSL enabled for these pages.

Thank you. We are working on checking these issues and adding them to the next release.

Please note about shipping. Some shipping methods do not show if product weight, dimensions conditions are not met. For example:
Say you have USPS, but your total product weight/dimension is larger than minimum for the services that you have set with USPS. In this case USPS shipping method will not show. In case, you have only 1 USPS method enabled, there will be no shipping method at all. User will get an error.

We are looking into this and will include in the next version next week.

Regarding language warnings.

There are times where translations are missing and default values are used. We will check these once too.

Keep in mind that you can add/edit missing text definition and these warnings will never be seen again. These was done intentional to warn users of possible missing text or translations.