Expose a few mutable properties that make sense; most are still read-only for existing payloads. The obvious major point missing in this is the ability to create new payloads from fields.. coming soon

Dalamud/Game/Chat/SeStringHandling/Payloads/ItemPayload.cs

@@ -21,11 +21,25 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
             }
         }
 
+        // mainly to allow overriding the name (for things like owo)
+        private string displayName;
+        public string DisplayName
+        {
+            get
+            {
+                return this.displayName;
+            }
+
+            set
+            {
+                this.displayName = value;
+                Dirty = true;
+            }
+        }
+
         public bool IsHQ { get; private set; } = false;
 
         private uint itemId;
-        // mainly to allow overriding the name (for things like owo)
-        private string displayName;
 
         public override string ToString()
         {

Dalamud/Game/Chat/SeStringHandling/Payloads/PlayerPayload.cs

@@ -10,7 +10,16 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
     {
         public override PayloadType Type => PayloadType.Player;
 
-        public string PlayerName { get; private set; }
+        private string playerName;
+        public string PlayerName
+        {
+            get { return this.playerName; }
+            set
+            {
+                this.playerName = value;
+                Dirty = true;
+            }
+        }
 
         private World world;
         public World World
@@ -31,7 +40,7 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
 
         protected override byte[] EncodeImpl()
         {
-            var chunkLen = PlayerName.Length + 7;
+            var chunkLen = this.playerName.Length + 7;
             var bytes = new List<byte>()
             {
                 START_BYTE,
@@ -39,18 +48,20 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
                 /* unk */ 0x01,
                 (byte)(this.serverId+1),                 // I didn't want to deal with single-byte values in MakeInteger, so we have to do the +1 manually
                 /* unk */0x01, /* unk */0xFF,       // these sometimes vary but are frequently this
-                (byte)(PlayerName.Length+1)
+                (byte)(this.playerName.Length+1)
             };
 
-            bytes.AddRange(Encoding.UTF8.GetBytes(PlayerName));
+            bytes.AddRange(Encoding.UTF8.GetBytes(this.playerName));
             bytes.Add(END_BYTE);
 
             // encoded names are followed by the name in plain text again
             // use the payload parsing for consistency, as this is technically a new chunk
-            // bytes.AddRange(new TextPayload(PlayerName).Encode());
-
-            // FIXME
-            bytes.AddRange(Encoding.UTF8.GetBytes(PlayerName));
+            bytes.AddRange(
+                new TextPayload()
+                {
+                    Text = playerName
+                }.Encode()
+            );
 
             // unsure about this entire packet, but it seems to always follow a name
             bytes.AddRange(new byte[]
@@ -74,7 +85,7 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
             reader.ReadBytes(2);
 
             var nameLen = (int)GetInteger(reader);
-            PlayerName = Encoding.UTF8.GetString(reader.ReadBytes(nameLen));
+            this.playerName = Encoding.UTF8.GetString(reader.ReadBytes(nameLen));
         }
     }
 }

Dalamud/Game/Chat/SeStringHandling/Payloads/TextPayload.cs

@@ -9,7 +9,17 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
     {
         public override PayloadType Type => PayloadType.RawText;
 
-        public string Text { get; private set; }
+        // allow modifying the text of existing payloads on the fly
+        private string text;
+        public string Text
+        {
+            get { return this.text; }
+            set
+            {
+                this.text = value;
+                Dirty = true;
+            }
+        }
 
         public override string ToString()
         {
@@ -23,7 +33,7 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
 
         protected override void DecodeImpl(BinaryReader reader, long endOfStream)
         {
-            var text = new List<byte>();
+            var textBytes = new List<byte>();
 
             while (reader.BaseStream.Position < endOfStream)
             {
@@ -31,13 +41,13 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
                     break;
 
                 // not the most efficient, but the easiest
-                text.Add(reader.ReadByte());
+                textBytes.Add(reader.ReadByte());
             }
 
-            if (text.Count > 0)
+            if (textBytes.Count > 0)
             {
                 // TODO: handling of the game's assorted special unicode characters
-                Text = Encoding.UTF8.GetString(text.ToArray());
+                this.text = Encoding.UTF8.GetString(textBytes.ToArray());
             }
         }
     }

Dalamud/Game/Chat/SeStringHandling/Payloads/UIForegroundPayload.cs

@@ -19,6 +19,17 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
             }
         }
 
+        public ushort ColorKey
+        {
+            get { return this.colorKey; }
+            set
+            {
+                this.colorKey = value;
+                this.color = null;
+                Dirty = true;
+            }
+        }
+
         public uint RGB
         {
             get

Dalamud/Game/Chat/SeStringHandling/Payloads/UIGlowPayload.cs

@@ -19,6 +19,17 @@ namespace Dalamud.Game.Chat.SeStringHandling.Payloads
             }
         }
 
+        public ushort ColorKey
+        {
+            get { return this.colorKey; }
+            set
+            {
+                this.colorKey = value;
+                this.color = null;
+                Dirty = true;
+            }
+        }
+
         public uint RGB
         {
             get