The title says everything.
IPv6 increases in relevance on the internet so that should be added.
Or atp just make fivem completely open source so the good developers can add it themselves so we don’t have to rely on you unreliable FiveM developers.
Who uses IP as a legitimate player identifier. Doesn’t sound like solution a reliable developer would use since, you know, the player identifier shouldn’t change like an IP address can if you are using it to identify players.
Also, FiveM is open source except for the AC and infra resources. Maybe you should take a look and feel free to make a PR: GitHub - citizenfx/fivem: The source code for the Cfx.re modification frameworks, such as FiveM, RedM and LibertyM, as well as FXServer.