Init files

ModConfig.cs

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+namespace QToDrop {
+    public sealed class ModConfig {
+        public string DropItemKeybind { get; set; } = "Q";
+    }
+}

ModEntry.cs

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+using StardewModdingAPI;
+using StardewValley;
+
+namespace QToDrop {
+    public class ModEntry : Mod {
+        /// <summary>The mod configuration from the player.</summary>
+        private ModConfig Config;
+
+        private bool IsDropItemKeybindPressedFirstSequence = false;
+        private bool IsDropItemKeybindPressedSecondSequence = false;
+        private bool IsCTRLPressed = false;
+
+        /// <summary>The mod entry point, called after the mod is first loaded.</summary>
+        /// <param name="helper">Provides simplified APIs for writing mods.</param>
+        public override void Entry(IModHelper helper) {
+            this.Config = this.Helper.ReadConfig<ModConfig>();
+
+            helper.ConsoleCommands.Add("qtodrop", "Set drop item keybind", this.SetDropItemKeybind);
+
+            helper.Events.Input.ButtonPressed += this.OnButtonPressed;
+            helper.Events.Input.ButtonReleased += this.OnButtonReleased;
+
+            helper.Events.GameLoop.UpdateTicked += this.OnUpdateTicked;
+            helper.Events.GameLoop.OneSecondUpdateTicked += this.OnOneSecondUpdateTicked;
+        }
+
+        private void OnOneSecondUpdateTicked(object sender, StardewModdingAPI.Events.OneSecondUpdateTickedEventArgs e) {
+            if (IsDropItemKeybindPressedFirstSequence) {
+                IsDropItemKeybindPressedSecondSequence = true;
+            }
+        }
+
+        private void OnUpdateTicked(object sender, StardewModdingAPI.Events.UpdateTickedEventArgs e) {
+            if (IsDropItemKeybindPressedSecondSequence) {
+                Game1.player.dropActiveItem();
+            }
+        }
+
+        private void SetDropItemKeybind(string command, string[] args) {
+            if (args == null || args.Length == 0) {
+                Monitor.Log("Invalid arguments. Usage: qtodrop [none|keybind]", LogLevel.Error);
+                return;
+            }
+
+            string keybind = args[0];
+
+            if (keybind == "none") {
+                this.Config.DropItemKeybind = null;
+                Monitor.Log("Drop item keybind disabled.", LogLevel.Info);
+                return;
+            }
+
+            this.Config.DropItemKeybind = keybind.ToLower();
+            Monitor.Log("Drop item keybind set to " + keybind.ToUpper() + "!", LogLevel.Info);
+        }
+
+        private void OnButtonPressed(object sender, StardewModdingAPI.Events.ButtonPressedEventArgs e) {
+            if (e.Button == SButton.LeftControl || e.Button == SButton.RightControl) {
+                IsCTRLPressed = true;
+            }
+
+            if (e.Button.ToString().ToLower().Equals(this.Config.DropItemKeybind.ToLower())) {
+                IsDropItemKeybindPressedFirstSequence = true;
+
+                if (IsCTRLPressed) {
+                    if (Game1.player.CurrentItem == null || !Game1.player.CurrentItem.canBeDropped()) {
+                        return;
+                    }
+
+                    Game1.createItemDebris(Game1.player.CurrentItem, Game1.player.getStandingPosition(), Game1.player.FacingDirection);
+
+                    Game1.player.removeItemsFromInventory(Game1.player.CurrentItem.ParentSheetIndex, Game1.player.CurrentItem.Stack);
+                    Game1.player.showNotCarrying();
+                }
+
+                Game1.player.dropActiveItem();
+            }
+        }
+
+        private void OnButtonReleased(object sender, StardewModdingAPI.Events.ButtonReleasedEventArgs e) {
+            if (e.Button == SButton.LeftControl || e.Button == SButton.RightControl) {
+                IsCTRLPressed = false;
+            }
+
+            if (e.Button.ToString().ToLower().Equals(this.Config.DropItemKeybind.ToLower())) {
+                IsDropItemKeybindPressedFirstSequence = false;
+                IsDropItemKeybindPressedSecondSequence = false;
+            }
+        }
+    }
+}

QToDrop.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net5.0</TargetFramework>
+        <GamePath>C:\Program Files (x86)\Stardew Valley</GamePath>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Pathoschild.Stardew.ModBuildConfig" Version="4.1.0" />
+    </ItemGroup>
+
+</Project>

manifest.json

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+{
+  "Name": "QToDrop",
+  "Author": "brokiem",
+  "Version": "1.0.0",
+  "Description": "Drop items by pressing Q or custom keybind (like Minecraft)",
+  "UniqueID": "brokiem.QToDrop",
+  "EntryDll": "QToDrop.dll",
+  "MinimumApiVersion": "3.15.0",
+  "UpdateKeys": []
+}