I highly doubt it. As a TIR beta tester we tried some of that with the HL2 engine and although it was pretty cool, I'm pretty sure it tends to saturate bandwidth with multiple players all sending head position info on top of everything else that needs to go down the pipe.
Not saying it isn't possible or even practical, just that I would doubt it's important enough to take away processing power and bandwidth during online play.
Maybe the info could be sent only when in a certain proximity with another player or as an offline option?
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