Note: This patch isn't finished. When this patch is applied, you won't be able to log in with libsl with a password at all, because the patch needs more work to actually leave the password parameter out of the xmlrpc request.

Index: libsecondlife/Login.cs
===================================================================
--- libsecondlife/Login.cs	(revision 1490)
+++ libsecondlife/Login.cs	(working copy)
@@ -101,6 +101,8 @@
             /// <summary></summary>
             public string Password;
             /// <summary></summary>
+            public string WebLoginKey;
+            /// <summary></summary>
             public string Start;
             /// <summary></summary>
             public string Channel;
@@ -455,6 +457,8 @@
                 CurrentContext.Params.MAC = String.Empty;
             if (CurrentContext.Params.Channel == null)
                 CurrentContext.Params.Channel = String.Empty;
+            if (CurrentContext.Params.Password == null)
+                CurrentContext.Params.Password = String.Empty;
 
             // Convert the password to MD5 if it isn't already
             if (CurrentContext.Params.Password.Length != 35 && !CurrentContext.Params.Password.StartsWith("$1$"))
@@ -473,6 +477,7 @@
             loginParams.first = CurrentContext.Params.FirstName;
             loginParams.last = CurrentContext.Params.LastName;
             loginParams.passwd = CurrentContext.Params.Password;
+            loginParams.web_login_key = CurrentContext.Params.WebLoginKey;
             loginParams.start = CurrentContext.Params.Start;
             loginParams.channel = CurrentContext.Params.Channel;
             loginParams.version = CurrentContext.Params.Version;
@@ -798,6 +803,7 @@
             public string first;
             public string last;
             public string passwd;
+            public string web_login_key;
             public string start;
             public string channel;
             public string version;
Index: libsecondlife/examples/TestClient/Program.cs
===================================================================
--- libsecondlife/examples/TestClient/Program.cs	(revision 1490)
+++ libsecondlife/examples/TestClient/Program.cs	(working copy)
@@ -116,6 +116,16 @@
 
                     accounts.Add(account);
                 }
+                else if (arguments["first"] != null && arguments["last"] != null && arguments["loginkey"] != null)
+                {
+                    // Taking a single login off the command-line
+                    account = new LoginDetails();
+                    account.FirstName = arguments["first"];
+                    account.LastName = arguments["last"];
+                    account.WebLoginKey = arguments["loginkey"];
+
+                    accounts.Add(account);
+                }
                 else
                 {
                     throw new CommandLineArgumentsException();
Index: libsecondlife/examples/TestClient/ClientManager.cs
===================================================================
--- libsecondlife/examples/TestClient/ClientManager.cs	(revision 1490)
+++ libsecondlife/examples/TestClient/ClientManager.cs	(working copy)
@@ -13,6 +13,7 @@
         public string FirstName;
         public string LastName;
         public string Password;
+        public string WebLoginKey;
         public string StartLocation;
         public string MasterName;
         public LLUUID MasterKey;
@@ -100,6 +101,7 @@
 
             NetworkManager.LoginParams loginParams = client.Network.DefaultLoginParams(
                     account.FirstName, account.LastName, account.Password, "TestClient", contactPerson);
+            loginParams.WebLoginKey = account.WebLoginKey;
 
             if (!String.IsNullOrEmpty(account.StartLocation))
                 loginParams.Start = account.StartLocation;