I see where you're coming from ;)
I would suggest that because oculus and leap are still in their prerelease stages that we will have to wait to see what implementations will prove to be successful. Laterally thinking I can see use cases for leap operating controls in vehicles or otherwise. Maybe even a 3 dimensional gesture standard will be developed by oculus, who knows. However, in terms of coordinating movement through the world, another handheld device would be needed - One that would free you from being locked in front of a desk keyboard and mouse. One that allows you the head and body movement that would add to the immersion of being there in a military simulation. Imagine blind firing at someone from behind cover by literally moving your arm and hands to do it. Maybe something like the razor hyrda, even thou it has its limitations, could be used for movement and to represent the gun... I have a feeling that we will start to see marketing and promotion of new movement related gadgets leading up to the release of dev-kit oculus, in march. I don't think we'll see many releases, however until oculus outs the consumer version
I think Arma3 is the perfect platform to be championing this sort of immersion related gadgetry, if anything, because the devs spend so much time making things more realistic for us
Here's a link for anyone who's not seen leap yet: