I think that reintruducing high tier weaponry isn`t good idea. I like it as it now - elite weapon being really elite, being considred as a real treasure, something that is worth a lot.
We shoud balance existing weapon, add special perk to each of them, make them work in their own unique way, add some few but thinked through weapon for example grenade launcher.
We shoud make sure that each weapon is obtainable in several ways, for example Gatling shoud be obtainable in other place than Enclave, it shoud be reward as some high tier quest.
We shoud make thievery balanced, not totally useless but semi usefull. We shoud balance caps gaining by either nerfing slavers or by boosting gecko skin hunting or other activietes.
Caves need to be redone, solid knowledge of them shoud be added, clear information how to get Alien Blaster woud be nice.
Cats Paw and Green condoms shoud spawn in shops(most important part of this post!)