One could be custom events. Example the staff team would get a armored truck loaded with kredits and the players could try to rob it for big moneys. "Get rich or die trying" or a more peaceful one could be a race hosted by the staff.

Second one could be some new npc's that give difficult missions to complete for good rewards. Example transporting missions, they would have to get something from point A to point B, the transporter(s) could be killed during the mission. That one might be pretty hard to get in, but just an example.

Third one could do something with the weed mod, maybe a weed dealer that buys the good stuff and sells some seeds to get it started.

This one is a far hit, but maybe some "gambling npc" something to do with lottery that people can bet in and one person will take the victory home after there is enough bets placed in.

Adding in hits and drugs as said above would be a great way, but make it to where somebody can kill the dealer if caught. Add in Feasts that drop kredits but are Kos zones. The credit grind isn't too bad right now with the new system. Also don't forget you guys can kidnap people hold them for ransom😉 that could potentially pay some good money😂

Some good ideas for sure, I would prefer a self-sustaining system though, something that doesn't involve manual events held by staff. It'd be nice to have something that players can just get on with whenever they want. I like the idea of some sort of drugs, maybe a secret NPC who sells and buys some questionable items for a good price. Especially if those items were the result of a long/difficult crafting recipe. 

I don't wana go as far as to have jobs and salaries as that would certainly take away from the survival aspect we wan't to keep, though some unofficial jobs that stick to the apocalypse theme could work (Such as a supply runner, airdrop retriever, farmer etc) They could be paid by players willing or staff- maybe we could figure out an automatic system later on too.

NPC's are a good foundation, although you have many mods on the server, you can use the more farming mod. The Composite Fishing Rod allows you to fish for other things such as krabs. maybe have a fisher NPC that will buy this type of fish and sell the fishing rod needed.

Farming berries and such in your own home. Now the berries themselves won't sell for much but refined berries can sell for more.

As for your airdrop runners and such. Have an NPC that will buy the vanilla guns that are found in airdrops (making a hells fury the most expensive)

Even the ability to just sell logs and maple syrup (from maple trees)

Some items in the game are never used as they are useless, let these type of items be sold. (example is a soul crystal, they make clothing but not everyone wants to wear a witch)

Also you could add a bounty system (if possible) Players who constantly rob players and get away with it. So that when they rob again and the person that they are robbing kills them gets a large reward for killing such a criminal