[Roko_foko]

pawn Code:

CMD:drag(playerid, params[])
{
    if(!IsPlayerInAnyVehicle(playerid)){
        SetPlayerPos(playerid, -2911.2407,-194.6217,2.7821);
        CreateDynamicObject(4247, -3037.851074, -103.473968, 1.177714, 0.000000, 0.000000, 0.000000,1,-1,-1,300.0);//floor
        SetPlayerFacingAngle(playerid, 0.0);
        SetPlayerInterior(playerid, 0);
        new string[128], pName[MAX_PLAYER_NAME];
        GetPlayerName(playerid, pName, MAX_PLAYER_NAME);
        format(string, sizeof(string), "{6666FF}(/drag) {00CCFF}%s {6666FF}has Teleported to Drag Area",pName);
        SendClientMessageToAll(playerid, string);
        SetPlayerVirtualWorld(playerid, 1);
    }
    else{
        new veh = GetPlayerVehicleID(playerid);
        LinkVehicleToInterior(veh, 0);
        SetVehiclePos(veh, -2911.2407,-194.6217,2.7821);
        SetVehicleZAngle(veh, 0.0);
        SetPlayerPos(playerid, -2911.2407,-194.6217,2.7821);
        CreateDynamicObject(4247, -3037.851074, -103.473968, 1.177714, 0.000000, 0.000000, 0.000000,1,-1,-1,300.0);//floor
        new string[128], pName[MAX_PLAYER_NAME];
        GetPlayerName(playerid, pName, MAX_PLAYER_NAME);
        format(string, sizeof(string), "{6666FF}(/drag) {00CCFF}%s {6666FF}has Teleported to Drag Area",pName);
        SendClientMessageToAll(playerid, string);
        PutPlayerInVehicle(playerid, veh, 0);
        SetVehicleVirtualWorld(veh, 1);
        SetPlayerVirtualWorld(playerid, 1);
    }
    gCommandsDisabled[playerid]==true;//add this <-<-<-<-<-<-<-<-<-<
    return SendClientMessage(playerid, 0xFF0000FF, "You have been teleported to Drag Arena");

}

pawn Code:

OnPlayerCommandText(playerid,cmdtext[])
{
     if(strcmp(cmdtext,"/t")==0 && cmdtext[2]=='\0')
     {
          if(gCommandsDisabled[playerid]==true)
          {
                // Now show him the dialog
                return 1:
          }
            //...
     }

so after the command /drag is used, the /t command is not available for player.
Once you want to enable the command, for example: when player dies just put the gCOmmandsDisabled[playerid]=false;

pawn Code:

OnPlayerDeath(//blah blah)
{
     gCOmmandsDisabled[playerid]=false;
     //rest of the code
}