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     There are two main user bases, HMD and traditional monitor+webcam users,
     each wants a drastically different curve profile (HMD is 1:1 on all axes)
     Also re:boost, I'd rather avoid extra library dependences if possible.
+    
+    Rift tracker could do with positional estimation using intertial sensors.
+    Rift could do with a return-yaw-to-centre hotkey that's not the global all-axis option.
+    Hydra is really just a hack just now, could be improved a lot.
 20131005 sh
     what do you think about boost 1.54 for property maps -> qsettings?
     also, boost concepts