Hi,
thanks zmove for your contribution, works well with my client's store.

I have couple suggestions for this module:

1) The product price should be able to have the choice if it's added including or excluding taxes. (example image attached)

In business-to-business shops the VAT exclusion is ok, but when dealing with business-to-customer, the VAT/taxes are not that critical to know. I't actually a real pain to first decide what the customer-price is and then calculate the tax manually. But the tax separation should still be shown in the checkout panes.

2) If the product is added with tax, then the taxes should be calculated EVERYWHERE, even the checkout review-pane. I had to override some functions in order to get it work...

But great job so far! I'd be glad to help in testing & debugging if needed.