Hook up the spawn selector.

OpenRA.Mods.RA/ServerTraits/LobbyCommands.cs

@@ -321,7 +321,8 @@ namespace OpenRA.Mods.RA.Server
 				AllowBots = pr.AllowBots,
 				LockRace = pr.LockRace,
 				LockColor = pr.LockColor,
-				LockTeam = false
+				LockTeam = false,
+				LockSpawn = false
 			};
 		}
 

OpenRA.Mods.RA/ServerTraits/PlayerCommands.cs

@@ -94,7 +94,11 @@ namespace OpenRA.Mods.RA.Server
 							return true;
 
 						// Spectators don't need a spawnpoint
-						if (client.Slot == null)
+						if (targetClient.Slot == null)
+							return true;
+
+						// Map has disabled spawn changes
+						if (server.lobbyInfo.Slots[targetClient.Slot].LockSpawn)
 							return true;
 
 						int spawnPoint;