While playing as MVS I noticed they have too little faction traits, and now I realize why: it is the trait they need doesn't exist.
So traits suggestion:
"Commercial": hates pirates, behaviour similar to monopolist but less extreme, they prefer oligopoly instead (ie: they like trade so they need other economic powerhouses, but they don't want to be left behind in market share by too much).
"Arms Trader": lower limit for selling stuff on military market, but probably won't ever sell their own blueprints willingly (Except for modspecs maybe, since the game doesn't have another way of getting those). Disposition bonus toward factions that are being screwed by others...
idea is "commercial" and "arms trader" traits would usually be used with each other, with factions suggested for needing these traits being MVS, Dassault-Myiokan, Diable, etc...
Idea is "commercial" factions care about trading and hate trade disruptions, so they don't like pirates, raiders, blockades, etc... don't like competitors that are blocking them out of market (monopolists), and so on.
Idea for "arms trader" is mark specific factions that derive their power from arms trade, and thus trive selling ships and weapons to others, maybe they aren't "commercial" in normal sense and are monopolist instead, or they support pirates. What matters to them is have guns in their clients pockets, and money in their own pocket, also they probably love underdogs that need "help" but have money, like Mayasuran navy (or any faction reduced to too few markets and risk being wiped out), because this means those factions are desperately in need of weapons and probably would take loans and do whatever it takes to get them, and having them disappear means less clients.
Is it possible for faction mods add new traits to Nex by the way?