Road map priority #2 - stabilize the current product
There is no need to make another non-working, or half-working, release.
Make sure the current code base is as bug free as possible. Not only in the most simple use cases, but in real environments with multiple advanced features combined.
Until new users are able to download, install and use LC without too much hazzle there is very little need for now "half-ready" features.
As you pint out in the roadmap document "interesting things" can happen with prices/taxes/discounts ... make sure it works! .... and disable any features that does not work.
Having a cart that sets random prices and/or makes customers fall asleep due to long execution is really not someting a merchant wants in his cart.
You should handle money as a safety critical resource. Imagine if this was a medical device, and it was behaving randomly ... a lost customer or a killed patient is really not much different.