Thanks a lot!
Here's a quick addon to make this permanent:
local frame = CreateFrame("frame")
frame:RegisterEvent("PLAYER_ENTERING_WORLD")
frame:SetScript("OnEvent", function()
SetCVar("cameraYawMoveSpeed", 180.0)
SetCVar("cameraPitchMoveSpeed", 90.0)
SetCVar("enableMouseSpeed", 0)
end)
Just paste this into http://addon.bool.no/ and click "Create my Addon"