I believe this issue is related to another one: The invisible mouse pointer problem. In trying to play KSP via in-home streaming, I discovered that if the host computer does not have a mouse connected, then you will not be able to see a mouse pointer when streaming a game (Win 8.1 host). However, the right-click-drag mechanic DOES work, even in KSP. I connected a garbage mouse to the host PC to fix the invisible pointer (which worked), but then I lost the ability to move the camera with the right-click-drag motion. As it is, I can drag the camera with the mouse or see my mouse pointer, but not both.