No, other tax software use an average conversion rate to calculate the capital gain. Of course the Real historic rates cannot be used because it is simply impossible to track all the historical conversion rates (buy and sell) of that many transactions. (A stock that as been sold this year might have been bought two years ago)
The difference between the average rates and the real historical rates is not that important (sometimes you loose sometimes you gain), and it's not a capital gain or loss, it's a convertion gain or loss. You are not taxed on the withdrawal of your US bank account compared to the rate you purchased the US $ in the first place.
Other tax software already have this (support the currency code and convert amount with an average rate), and I will not use TurboTax anymore If you don't add it because it's just too much work to edit all transactions that have been imported from CRA.
