Better hit object defaults setting.

osu.Game/Modes/Objects/HitObject.cs

@@ -22,5 +22,11 @@ namespace osu.Game.Modes.Objects
         /// The sample to be played when this HitObject is hit.
         /// </summary>
         public HitSampleInfo Sample { get; set; }
+
+        /// <summary>
+        /// Applies default values to this HitObject.
+        /// </summary>
+        /// <param name="defaults">The default values to apply.</param>
+        public virtual void ApplyDefaults(HitObjectDefaults defaults) { }
     }
 }

osu.Game/Modes/Objects/HitObjectDefaults.cs

@@ -0,0 +1,25 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Timing;
+using osu.Game.Database;
+
+namespace osu.Game.Modes.Objects
+{
+    /// <summary>
+    /// A set of default Beatmap values for HitObjects to consume.
+    /// </summary>
+    public class HitObjectDefaults
+    {
+        /// <summary>
+        /// The Beatmap timing.
+        /// </summary>
+        public TimingInfo Timing;
+
+        /// <summary>
+        /// The Beatmap difficulty.
+        /// </summary>
+        public BaseDifficulty Difficulty;
+    }
+}