Allow screen to specify whether to apply audio rate adjustments from mods

osu.Game/Screens/IOsuScreen.cs

@@ -51,5 +51,10 @@ namespace osu.Game.Screens
         Bindable<WorkingBeatmap> Beatmap { get; }
 
         Bindable<RulesetInfo> Ruleset { get; }
+
+        /// <summary>
+        /// Whether mod rate adjustments are allowed to be applied.
+        /// </summary>
+        bool AllowRateAdjustments { get; }
     }
 }