Turbotax Desktop supports more transactions than the online version. I just went through this exact situation, and switching to that is your best option (as of 2015). Unfortunately, the desktop version requires you to restart your return, and it's nightmarishly slow with a lot of transactions. It seems to re-compute all the transactions every time you do something, so your best bet is to complete your full return and import the Wealthfront transactions as your very last step. Hopefully this won't be an issue in future years as the online version improves.