diff --git a/README.md b/README.md
index a87fb0b..b8db085 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,16 @@ This plugin can be used to install BAIN archives containing a wizard script (`wi
 Go to the [releases page](https://github.com/Holt59/modorganizer-installer_wizard/releases) and download
 the latest release for your MO2 version.
 
+### A few words on INI Tweaks
+
+Mod Organizer 2 does not currently manage INI Tweaks, so the Wizard installer is partially functional
+regarding them.
+
+- The installer will create proper INI Tweaks when requested, but these will not be applied
+  to the game INI files automatically. If INI Tweaks are present, a pop-up should appear at
+  the end of the installation.
+- INI Tweaks for OBSE script are directly applied to the OBSE scripts.
+
 ## How to contribute?
 
 ### Setting-up the environment
diff --git a/src/installer.py b/src/installer.py
index 4186967..4e56c41 100644
--- a/src/installer.py
+++ b/src/installer.py
@@ -311,8 +311,6 @@ class WizardInstaller(mobase.IPluginInstallerSimple):
 
             for filename, tweaks in alltweaks.items():
 
-                print(tweaks)
-
                 # Find the original file (if any):
                 o_entry = tree.find(filename)
                 o_filename: Optional[str] = None
diff --git a/src/utils.py b/src/utils.py
index 47cd143..f08ff75 100644
--- a/src/utils.py
+++ b/src/utils.py
@@ -1,7 +1,9 @@
 # -*- encoding: utf-8 -*-
 
+import re
+
 from pathlib import Path
-from typing import List, Mapping
+from typing import Dict, List, Mapping
 
 from wizard.tweaks import WizardINISetting, WizardINISettingEdit
 
@@ -47,9 +49,107 @@ def make_standard_ini_tweaks(tweaks: List[WizardINISetting]) -> str:
     return "\n".join(lines[:-1])
 
 
+def merge_standard_ini_tweaks(tweaks: List[WizardINISetting], file: Path) -> str:
+    print(f"Cannot merge INI Tweaks for {file.name}.", file=sys.stderr)
+    return make_standard_ini_tweaks(tweaks)
+
+
+def merge_obscript_ini_tweaks(tweaks: List[WizardINISetting], file: Path) -> str:
+
+    # This is from Wrye Bash (and the function is inspired from Wrye Bash):
+    reComment = re.compile(";.*", re.U)
+    reDeleted = re.compile("" r";-(\w.*?)$", re.U)
+    reSet = re.compile("" r"\s*set\s+(.+?)\s+to\s+(.*)", re.I | re.U)
+    reSetGS = re.compile("" r"\s*setGS\s+(.+?)\s+(.*)", re.I | re.U)
+    reSetNGS = re.compile("" r"\s*SetNumericGameSetting\s+(.+?)\s+(.*)", re.I | re.U)
+
+    _regex_tuples = (
+        (reSet, "set", "set {} to {}"),
+        (reSetGS, "setgs", "setGS {} {}"),
+        (reSetNGS, "setnumericgamesetting", "SetNumericGameSetting {} {}"),
+    )
+
+    def _parse_obse_line(line):
+        for regex, sectionKey, format_string in _regex_tuples:
+            match = regex.match(line)
+            if match:
+                return match, sectionKey, format_string
+        return None, None, None
+
+    # Read the original file:
+    with open(file, "r") as fp:
+        olines = fp.readlines()
+
+    # Map setting name to value:
+    settings: Dict[str, Dict[str, WizardINISettingEdit]] = {}
+    deleted: Dict[str, Dict[str, WizardINISetting]] = {}
+    for tweak in tweaks:
+        if isinstance(tweak, WizardINISettingEdit):
+            if tweak.section not in settings:
+                settings[tweak.section.lower()] = {}
+            settings[tweak.section.lower()][tweak.setting] = tweak
+        else:
+            if tweak.section not in deleted:
+                deleted[tweak.section.lower()] = {}
+            deleted[tweak.section.lower()][tweak.setting] = tweak
+
+    # Create the lines:
+    lines = []
+    for line in olines:
+        line = line.rstrip()
+        maDeleted = reDeleted.match(line)
+        if maDeleted:
+            stripped = maDeleted.group(1)
+        else:
+            stripped = line
+        stripped = reComment.sub("", stripped).strip()
+
+        match, section_key, format_string = _parse_obse_line(stripped)
+
+        if match:
+            setting = match.group(1)
+            if section_key in settings and setting in settings[section_key]:
+                value = settings[section_key][setting].value
+                line = format_string.format(setting, value)
+                comment = ""
+                if settings[section_key][setting].comment:
+                    comment = settings[section_key][setting].comment  # type: ignore
+                    comment += " "
+                comment += f"(set by MO2 via Wizard, was {match.group(2)})"
+                line = f"{line}  ; {comment}"
+                del settings[section_key][setting]
+            elif (
+                not maDeleted
+                and section_key in deleted
+                and setting in deleted[section_key]
+            ):
+                line = f";-{line}"
+
+        lines.append(line)
+
+    for section in settings.values():
+        for setting in section.values():
+            if setting.section.lower() == "set":
+                line = f"{setting.section} {setting.setting} to {setting.value}"
+            else:
+                line = f"{setting.section} {setting.setting} {setting.value}"
+
+            if setting.comment:
+                comment = setting.comment + " (set by MO2 via Wizard)"
+            else:
+                comment = "(set by MO2 via Wizard)"
+            line = f"{line}  ; {comment}"
+
+        lines.append(line)
+
+    return "\n".join(lines)
+
+
 def make_ini_tweaks(tweaks: List[WizardINISetting]) -> str:
 
-    is_set = [tw.section in ("set", "setGS", "SetNumericGameSetting") for tw in tweaks]
+    is_set = [
+        tw.section.lower() in ("set", "setgs", "setnumericgamesetting") for tw in tweaks
+    ]
 
     # Assume there is no mix.
     if all(is_set):
@@ -60,11 +160,12 @@ def make_ini_tweaks(tweaks: List[WizardINISetting]) -> str:
 
 def merge_ini_tweaks(tweaks: List[WizardINISetting], file: Path) -> str:
 
-    is_set = [tw.section in ("set", "setGS", "SetNumericGameSetting") for tw in tweaks]
+    is_set = [
+        tw.section.lower() in ("set", "setgs", "setnumericgamesetting") for tw in tweaks
+    ]
 
     # Assume there is no mix.
     if all(is_set):
-        pass
+        return merge_obscript_ini_tweaks(tweaks, file)
     else:
-        pass
-    return ""
+        return merge_standard_ini_tweaks(tweaks, file)