Don't be ridiculous. Spears are heavy and we are already paying our heroes and soldiers next to nothing. Now you want them to carry a shield too?

But seriously, it would take very little modding to make a polearm weapon class. The real question is how it would interact with the current weapon environment. 

Yeah, it would be nice to have more historically accurate/practical weapons, instead of just swords and axes everywhere.

What about roman empire shield 'turtle' formation?  or Phalanx (massed polearms?) etc.

I agree with lord Xia, only country that don't use shield is the japanese. all other country use at least some form of shields.

Ha! And I suppose the next thing you'll ask for is a pony.