On twitter dinnerbone said that you could use the mouseweel to change speed while flying in spectator mode, you can't
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I too am having this exact issue, i use the scrollwheel to try and speed up and down and it doesn't work at all, one of my friends has zero issues with it.
The only "mouse" difference between the 2 of us is that he is using a wired mouse while i am using a wireless mouse.
scrolling through the hotbar in survival and creative mode works for me, just not spectator mode.
No mentioning of the scrollwheel onhttps://mojang.com/, butNevermind.