diff --git a/basic_features/__init__.py b/basic_features/__init__.py
index 66e9a76..64200b5 100644
--- a/basic_features/__init__.py
+++ b/basic_features/__init__.py
@@ -1,4 +1,4 @@
-from .basic_mod_data_checker import BasicModDataChecker
+from .basic_mod_data_checker import BasicModDataChecker, GlobPatterns
 from .basic_save_game_info import BasicGameSaveGameInfo
 
-__all__ = ["BasicModDataChecker", "BasicGameSaveGameInfo"]
+__all__ = ["BasicModDataChecker", "BasicGameSaveGameInfo", "GlobPatterns"]
diff --git a/basic_features/basic_mod_data_checker.py b/basic_features/basic_mod_data_checker.py
index 4bceac1..8c80919 100644
--- a/basic_features/basic_mod_data_checker.py
+++ b/basic_features/basic_mod_data_checker.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import fnmatch
 import re
 from dataclasses import dataclass, field
-from typing import Iterable
+from typing import Iterable, Literal
 
 import mobase
 
@@ -60,6 +60,13 @@ class RegexPatterns:
         return None
 
 
+def _merge_list(l1: list[str] | None, l2: list[str] | None) -> list[str] | None:
+    if l1 is None and l2 is None:
+        return None
+
+    return (l1 or []) + (l2 or [])
+
+
 @dataclass(frozen=True, unsafe_hash=True)
 class GlobPatterns:
     """
@@ -71,6 +78,41 @@ class GlobPatterns:
     delete: list[str] | None = None
     move: dict[str, str] = field(default_factory=dict)
 
+    def merge(
+        self, other: GlobPatterns, mode: Literal["merge", "replace"] = "replace"
+    ) -> GlobPatterns:
+        """
+        Construct a new GlobPatterns by merging the current one with the given one.
+
+        There are two different modes:
+          - 'merge': In this mode, unfold/valid/delete are concatenated and move
+            will contain the union of key from self and other, with values from other
+            overriding common keys.
+          - 'replace': The merged object will contains attributes from other, except
+            for None attributes taken from self.
+
+        Args:
+            other: Other patterns to "merge" with this one.
+            mode: Merge mode.
+
+        Returns:
+            A new glob pattern representing the merge of this one with other.
+        """
+        if mode == "merge":
+            return GlobPatterns(
+                unfold=_merge_list(self.unfold, other.unfold),
+                valid=_merge_list(self.valid, other.valid),
+                delete=_merge_list(self.delete, other.delete),
+                move=self.move | other.move,
+            )
+        else:
+            return GlobPatterns(
+                unfold=other.unfold or self.unfold,
+                valid=other.valid or self.valid,
+                delete=other.delete or self.delete,
+                move=other.move or self.move,
+            )
+
 
 class BasicModDataChecker(mobase.ModDataChecker):
     """Game feature that is used to check and fix the content of a data tree
diff --git a/games/game_subnautica.py b/games/game_subnautica.py
index d72677e..b2c64c3 100644
--- a/games/game_subnautica.py
+++ b/games/game_subnautica.py
@@ -8,7 +8,7 @@ from pathlib import Path
 import mobase
 from PyQt6.QtCore import QDir, qWarning
 
-from ..basic_features import BasicModDataChecker
+from ..basic_features import BasicModDataChecker, GlobPatterns
 from ..basic_features.basic_save_game_info import (
     BasicGameSaveGame,
     BasicGameSaveGameInfo,
@@ -17,18 +17,21 @@ from ..basic_game import BasicGame
 
 
 class SubnauticaModDataChecker(BasicModDataChecker):
-    default_file_patterns = {
-        "unfold": ["BepInExPack_Subnautica"],
-        "valid": ["winhttp.dll", "doorstop_config.ini", "BepInEx", "QMods"],
-        "delete": [
-            "*.txt",
-            "*.md",
-            "icon.png",
-            "license",
-            "manifest.json",
-        ],
-        "move": {"plugins": "BepInEx/", "patchers": "BepInEx/", "*": "QMods/"},
-    }
+    def __init__(self, patterns: GlobPatterns = GlobPatterns()):
+        super().__init__(
+            GlobPatterns(
+                unfold=["BepInExPack_Subnautica"],
+                valid=["winhttp.dll", "doorstop_config.ini", "BepInEx", "QMods"],
+                delete=[
+                    "*.txt",
+                    "*.md",
+                    "icon.png",
+                    "license",
+                    "manifest.json",
+                ],
+                move={"plugins": "BepInEx/", "patchers": "BepInEx/", "*": "QMods/"},
+            ).merge(patterns),
+        )
 
 
 class SubnauticaGame(BasicGame, mobase.IPluginFileMapper):