Those aren't the unused commands those are the commands used. If something isn't working report it.
The first element is a array of text commands so each command can have multiple triggers.
The next is the function.
The next is the parameters.
The next is a flag that specifies if it is for client only or if it can be a client to host command if clientside commands were enabled.
But these should currently be in the game and work if you're the host.
:i $cmd_strings$ = :a{
%s(0,"/END")
%s(0,"/ENDGAME")
:a}
opens the game option menu
:i $cmd_strings$ = :a{
%s(0,"/GAME")
%s(0,"7GAME")
%s(0,"/GAEM")
%s(0,"/GEAM")
%s(0,"/gamegame!")
%s(0,"/gaem pls")
:a}
starts last selected game
:i $cmd_strings$ = :a{
%s(0,"/START")
%s(0,"/START A GAME")
%s(0,"/START A FUCKING GAME")
:a}