I'm really interested in the idea of variant weapons in general. Star Trek Online has a system where weapons randomly have mild (like, a percent or two) differences in stats. Certain ones are considered more valuable for different purposes in different metas, eg. sustained DPS favours [Dmg]x3 despite the general increase in damage being fairly low per [Dmg], burst damage favours a crit-heavy build using [CrtD]x3 weapons and crit chance increasing abilities, et cetera. Despite PvP not being very popular in the game, it's a really neat system that we could benefit from in some cases.
I would love to have "low end codenames" drop from missions and stuff, both for sub-capitals and capitals. I feel like it's going to be something that needs a lot of time to draft out, balance on paper, implement, and balance in testing, though.