Giving move orders with x, y, and z axis

[Falcrack]

How do I give orders not just along the flat x y axis, but also up and down? Is there a way that I can shift the cursor so that it will be able to move the ships above or below the plane? I hate being limited to what is in essence a flat map, space is 3D, I want to use that 3rd "D" when giving orders! Please tell me I am simply missing something and they have a way to accomplish this which I have overlooked!