What about a BFG?
Just kidding, but i would really like to have some kind of RAILGUN in hands of my enforcer, it might be considered an energy weapon or a particle weapon (Beam Rifle in F.E.A.R.
http://fear.dasmirnov.net/info/weapons.php) with no scope/zoom or maybe max x2 scope so it will be considered close range weapon.
Mines would be nice to keep a sniper's back safe, but i dont think any1 else will find a good use for that. On the other hand if mines will be present in Huxley, all battlefield will become a minefield.