Say two sides are fighting with IC mining lasers. Normally when fighting, going downhill gives crits. I am willing to guess that even mining lasers don't give crits, the uphill fighters still have the advantage. The downhill fighters would have to jump and leap and stack their way up, reducing the amount of time for shooting. The uphill fighters can simply charge downhill, and wear a cheap pair of rubber boots to negate most of the fall damage. Am I right?
Also, would this apply to fighting while jetpacking? The jetpack doesn't let the user equip a batpack or a lappack. It is hard to aim when jetting up and down randomly, but it is also hard to be hit. I guess you could put hover on, strike with some explosive shots, and un hover and dart out of enemy fire.