SetPlayerMapIconEx

stock SetPlayerMapIconEx(playerid, Float:x, Float:y, Float:z, markertype, color, style)
{
    SetPlayerMapIcon(playerid, GetPVarInt(playerid, "IconID"), Float:x, Float:y, Float:z, markertype, color, style);
    new iID = GetPVarInt(playerid, "IconID");
    SetPVarInt(playerid, "IconID", GetPVarInt(playerid, "IconID")+1);
    return iID;
}

/* und dann bei OnPlayerDisconnect: */
DeletePVar(playerid, "IconID");