I have no idea how you'd operate a 3 way valve, but if you need more zones, you'd need to install an expander board.
Each expander board is $50 USD. 2 boards can be installed under the main board. The expander boards are always pre-installed at the factory, we don't recommend users to install it, but someone with some electronics background can do it, but we do not support it. Besides, it would require open up the case, remove the main board (which voids the warranty), then install the expander board(s) in the slot(s) beneath the main board and then connect the power and data cable.
If you understand the risk and still wish to acquire an expander board, you can order it by emailing our support or sales group. We will fulfil it, but we must say that we cannot support it.