Please consider moon physics! I haven't heard anyone talk about this but I've thought this was the answer to locomotion in VR. It strikes a balance between realistic movement and not being too tiring, and moon jumping would be hella fun, especially in a FPS.
We’re mostly intrigued with 1:1 locomotion and agility in competitive multiplayer. For instance players who can run a marathon, or throw a baseball, will have a distinct competitive advantage over players who cannot. But, in theory, if you played enough it would supplement physical training.
For the casual gamer it may not be interesting, though that depends on the learning curve - eg regular sports can be pretty challenging and physically exhausting, yet people play them casually.
But in particular competitive gaming and esports would get a lot more interesting this way.
Ever played instagib with a low gravity mod in a regular FPS? It can be fun, but the gameplay becomes pretty limited, and I imagine the moon physics being similar in a VR FPS. Maybe projectile weapons only would make it work better, or the fact that hitscan is a lot harder in an HMD than with a monitor.
I always thought that the mitigating factor here would be that you don't have to take big loping leaps, you can also accomplish a fairly earth-like gait, just with fewer steps.
I could also see another way of using it that is similar to the teleport mechanic where you clear an area, make a big jump, and when you land you clear that next area before taking another jump. But it would be an interesting thing, almost like a angry birds pulling the slingshot back thing, where the accuracy of the jump is also put to the test.
Jumping in real life and then going back down and landing while your character is still moving up seems like a really efficient way to get nauseated. 1:1 motion is very immersive and very good for avoiding nausea, so it's not something to give up lightly.