Been successful in removing newsletter sign up from most of the site - still can't remove from customers account page under "NOTIFICATIONS AND NEWSLETTER" (see image)

Is there easy fix to this.

I am trying to understand what is the fix that you are looking for?

Looks like you want to show all the products in the category tree down. AbanteCart does not work this way.
This can be customized with updating query in the below product model.

https://github.com/abantecart/abantecart-src/blob/master/public_html/storefront/model/catalog/product.php#L227
public function getProductsByCategoryId( ...
Keep in mind that this SQL operation will be slow if you have many categories.

Because some times I have many sub-sub-categories and besides it doesn't make sense to add product in sub-category but not in parent category.. .

You do not have to add products to parent category. Once you go to subcategory you will see all the products in that category.

Yes, this is a template only update. Not hard to do.

Did not see anyone using this yet. Great idea for developers of extensions.

Welcome to AbanteCart Alexmark!

360 product viewer will be a combination of images and JavaScript. Am I right?

I did not hear anyone mentioning using it, but I do not see any issues with including that.

This would be something as simple as including JavaScript library and updating image tag on the product details page.

This topic has been moved to Customization help.

http://forum.abantecart.com/index.php?topic=5825.0