[PrO.GameR]

Your OnPlayerText would probably look like this:

PHP код:

public OnPlayerText(playerid, text[])
{
    new msg[128];
//Send the msg
    return 0;
} 


change it to

PHP код:

public OnPlayerText(playerid, text[])
{
    if(Player[id][Gagged] == 0)
    {
    new msg[128];
    //Send the msg
    }
    return 0;
} 


This simply checks if your player isn't gagged, you need to apply this to all your IC commands btw (/low /s /w) and others you have
for second one, you need to make a global variable that sets the time, and check if current time - that variable is more than your recharge time when a player shoots anotherone with your tazer gun, more info about the way I suggested here: forum.sa-mp.com/showthread.php?t=254915&highlight=unix+timestamp
as for your third question, simply take this out

PHP код:

            Player[playerid][CopDuty] = 1; 


( and the = 0 one too)
and make another cmd as /duty