I'd like to put forth the idea of a Lever Action Scout Rifle (sorry if it's been suggested before). I love westerns, I use handcannons simply because I feel like Clint Eastwood, going WahwahWahhhhhh after I headshot a group of Fallen. It feels wrong that we have something like the awesome single action Last Word without any other westernish weapons in the game. Something along the lines of the pic linked above would be awesome.
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More weapon models would be grand. If I can have a space-magic shotgun that makes its own ammunition out of stardust and the tears of my enemies, I don't think a lever action scout rifle is too much to ask.