EMP grenades are actually not really that crazy, --much to my surprise-- as someone with a physics degree. I can’t find any information about it on the internet now, but I am 100% entirely positive that the military has tested backpack-sized emp stuff. It doesn’t affect anything with military hardening (so robots would be unaffected) and has a very small range, of about a block. They were first used in the Iraq war. I don’t know why I can’t find anything about them on the internet now. (then again, HEMP (high altitude electromagnetic pulse) stuff has been basically purged from the internet, too, so I mean I guess I understand, especially in this day and age.) I mean, honestly, I can’t see them working for any -useful- purpose, but there’s just enough give that its not in the entirely fantasy realm, especially in the future. I certainly can’t see them being regular issue as the military wouldn’t have any domestic use for them in any circumstance I can conceive of. But you know, grain of salt. And it might be better from a gameplay point of view to move that stuff to a mod anyways since nothing is lost and makes the game more customizable.
That being said, no opinion on the above ideas, just commenting on the grenades due to geekyness…
EDIT: This is relevant. Not arguing for its implementation, and I reaalllly doubt it’ll ever sell in the US as it breaks a host of FCC regulations and would require better aiming or a lot more power to be practical then what they are claiming… buuuut: http://gizmodo.com/5454295/this-emp-cannon-stops-cars-almost-instantly
Edit 2: Though, you know…I’m suddenly getting ideas for enemies that would be reaaalllly annoying to people in invincible unstoppable death-machines…that happen to be speeding…