I think it is perfectly fine the way it is - codies are one of the few things that follow the logics of supply/demand here on Disco, and is as such a much more evolved commodity than everything else.
Besides the advantage you get over non-code users are in most cases small, unless you fly on a Freelancer ID. And for those, more variety in civvy guns has already been proposed a while back.
No need to obsess over codename guns, really. Better to ask for more variety in civvy guns.