I've noticed that there are a scant few melee weapons that are any shape other than swords, which seems like such a shame when there are so many other forms that melee weapons can take. Lances, polearms, and flails/blunt weapons would fit the overall "science fiction meets medieval knights" theme that the game has going, don't you think? I can see why this might not be a high priority, considering the huge variety and popularity of melee weapons in the game, but still.
Plus, having weapons with differing reaches would make for an interesting play experience in coordinated parties - having a blast bomber with a flail so that his overall build is centered around keeping enemies at a distance, coupled with a character with a high-end reach weapon to take care of the now-distant enemies, for example. Or maybe having a lance-type weapon (they are knights, after all) that gains benefits from the speed bonuses of the mercurial mail or mercurial demo suit. Perhaps melee weapons that can be thrown (e.g. axes) that gain benefits from ranged weapon bonuses, so that the gunners can do things at closer ranges?
+1. i've been meaning to learn spear myself irl so im very biased in this vote :P