How to make first person games more immersive

To me, it seems like the only thing left to do short of VR for first person games is to have some sort of goggles or glasses where the display is extra wide, taking advantage of someone's entire field of view (peripheral vision and all). Has anyone setup anything like EyeFinity? Does that actually widen the view or just stretch everything out?

I find the "virtual limbs/body" modelling (like Far Cry 3, Crysis, Mirror's Edge) goes a long way towards a more immersive experience. Expand on that.

agreed, that plus oculus rift (final version) good god! that would be amazing