I don't think peaking over and around stuff would be fair, and since RO doesn't use full body awareness like OpFlash looking around wouldn't work either.
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As in OFP...One issue to be wary of is the fact that non-TrackIR users would be at a disadvantage.
I could see this being implemented as a key activated Free Look system, with support for TrackIR.
Something like that [1] would be even more great.
Imagine you'd have to close your left eye to properly use the iron sights ...
[1] http://www.3dvisor.com/