Ban system by Serial same as MTA (or similiar)
When i had a SAMP server Dayz, i was tired of many times had problems with cheaters and toxic players that comeback to the server everytime.
You ban a player or a toxic player, and a few minutes later, the same player comeback with a different nickname just to annoying and disturb. When i had my server on MTA (2012/2013) i never had that problem. Once the player was banned, he couldn't come back again, even reseting the IP or formatting the PC.
He has really banned from the server.
I hope that you have a system like that, its something that is missing on the other plataform, but could really help people with a server. (Including Dayz, where the number of cheaters is a lot)