Mark ModTouchDevice as always valid for submission

osu.Game/Rulesets/Mods/IMod.cs

@@ -59,6 +59,13 @@ namespace osu.Game.Rulesets.Mods
         /// </summary>
         bool ValidForMultiplayerAsFreeMod { get; }
 
+        /// <summary>
+        /// Indicates that this mod is always permitted in scenarios wherein a user is submitting a score regardless of other circumstances.
+        /// Intended for mods that are informational in nature and do not really affect gameplay by themselves,
+        /// but are more of a gauge of increased/decreased difficulty due to the user's configuration (e.g. <see cref="ModTouchDevice"/>).
+        /// </summary>
+        bool AlwaysValidForSubmission { get; }
+
         /// <summary>
         /// Create a fresh <see cref="Mod"/> instance based on this mod.
         /// </summary>

osu.Game/Rulesets/Mods/Mod.cs

@@ -156,6 +156,10 @@ namespace osu.Game.Rulesets.Mods
         [JsonIgnore]
         public virtual bool ValidForMultiplayerAsFreeMod => true;
 
+        /// <inheritdoc/>
+        [JsonIgnore]
+        public virtual bool AlwaysValidForSubmission => false;
+
         /// <summary>
         /// Whether this mod requires configuration to apply changes to the game.
         /// </summary>

osu.Game/Rulesets/Mods/ModTouchDevice.cs

@@ -12,5 +12,6 @@ namespace osu.Game.Rulesets.Mods
         public sealed override LocalisableString Description => "Automatically applied to plays on devices with a touchscreen.";
         public sealed override double ScoreMultiplier => 1;
         public sealed override ModType Type => ModType.System;
+        public sealed override bool AlwaysValidForSubmission => true;
     }
 }