Sorry for the late reply, but I just noticed we recently released a feature that may help with this. Its creatively called Tax Exemptions and it doesn't use the older collection method.
You should be able to test it out in the Settings>Tax area right now, (called "Add tax override")
I've added your store to the beta program. Let us know if this is what you're looking for :-)
Shopify does indeed have a good setup for taxes. If you need to understand how taxes are applied please read "HOW TO APPLY CANADIAN TAXES WHEN SELLING ONLINE?" an article I wrote a while back that explain the logic behind charging taxes with an easy to use tax map.
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