Potentially adding a 10-15 second timer to the option 'restart' after the player has been knocked.
Example.
Player 1 knocks out Player 2 in a gun fight. Player 2 instantly goes into their menu and presses 'restart' which causes Player 1 to be cheated out of a kill.
This is a problem on all private servers and causes a lot of upset. If there was a timer in which Player 2 had to wait in order to 'restart' then it could prevent this situation from happening.
It is known as 'quick restarting' amongst players and has been a issue for a long time, a short timer that could even be edited within the files (private server) could keep all parties happy. Some servers may choose not to have it while others could choose the length of their 'restart timer'