I think it would be pretty cool to use two swords or two guns at the same time and to keep it balance reduce the DMG of the sword in your off hand when duel welding I just have a thing for welding two swords into battle xD
Edit: Also I think a skill tree of some sort would be nice to add the battle system and charge attacks are cool but I like my fair share of awesome skills to beat the baddies
This has been asked for a hundred times.... :P
But would be nice.