[Mean]

pawn Код:

new gotost[MAX_PLAYERS];

public OnPlayerConnect(playerid) {
    gotost[playerid] = 0; // 0 by default
    return 1;
}

CMD:togglegoto(playerid, params[]) {
    if(gotost[playerid] == 1) {
        SendClientMessage(playerid, -1, "Players can no longer teleport to you.");
        gotost[playerid] = 0;
    }
    else {
        SendClientMessage(playerid, -1, "Players can now teleport to you.");
        gotost[playerid] = 1;
    }
    return 1;
}

And in the goto command, add:

pawn Код:

if(gotost[id] == 1) {
    // teleport code
}
else SendClientMessage(playerid, -1, "You cannot teleport to this player.");