This idea I'm shameless stealing from MWO. Basically it works like thus, in MWO you have torso weapons mounted on your chest and arm weapons. Arms move faster and can be aimed easier. Torso weapons are a bit slower to adjust (they follow the arm crosshair but aren't instant) and more limited in where they can aim (more limits up/down). You can also aim each independently of one another which means you can shoot left and right at the same time with different weapons.

How would this apply to Reborn? No fucking idea but while it sounds like a stupid thing to have to worry about aiming two crosshairs instead of just one, in practice it's pretty cool. I also feel it adds quite a bit of aiming depth to MWO. You have to lineup shots and can't rely on twitch skills to react to everything on torso mounted weapons. Perhaps the railgun would be torso mounted in Reborn making it harder to aim with but other weapons would be arm mounted and extremely easy to aim with. You could even go a step further and have head mounted, torso mounted and arm mounted weapons putting in three crosshairs, Craziness.