I will give you my own preferences and what i want new and what i think people would want, i am currently making a RP map. I will post to this thread with everything i want to say soon.
Drugs? Like, there could be a command to buy a drug factory, it would look like lab equipment or something, and you cn use it to spawn drugs (with a cooldown timer), and when you take them they do something crazy like increase the bloom to 10000 or something
Yeah, that would be cool. How about a black market? With the ability to sell ALL of the weapons illegally, including police-only weapons, like the tazer. Of course buying them would be illegal, and if you get caught, you get arrested.
i think a gun store like you see that people have done on youtube would be funny, although you would need currency.. maybe food for gun exchange of equil value?
Inflation/deflation system! If players are not buying things from any of the NPCs in the server; prices drop. If players are buying things out the ass then the prices for the objects they're buying should increase.