diff --git a/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib b/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib
index bfc22739..378e7c0f 100644
--- a/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib
+++ b/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib
@@ -536,6 +536,16 @@
                         <binding destination="32" name="value" keyPath="values.KeepReadingUponCompositionError" id="ddF-qg-jes"/>
                     </connections>
                 </button>
+                <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="FCB-ax-ARZ">
+                    <rect key="frame" x="19" y="39.5" width="388" height="16"/>
+                    <buttonCell key="cell" type="check" title="Also toggle alphanumerical mode with Left-Shift" bezelStyle="regularSquare" imagePosition="left" controlSize="small" inset="2" id="chkTogglingAlphanumericalModeWithLShift">
+                        <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                        <font key="font" metaFont="cellTitle"/>
+                    </buttonCell>
+                    <connections>
+                        <binding destination="32" name="value" keyPath="values.TogglingAlphanumericalModeWithLShift" id="XW6-un-l8B"/>
+                    </connections>
+                </button>
             </subviews>
             <constraints>
                 <constraint firstItem="n7q-ew-DYu" firstAttribute="leading" secondItem="XWo-36-xGi" secondAttribute="leading" constant="33" id="2gT-9Z-6F4"/>
@@ -548,6 +558,8 @@
                 <constraint firstItem="15" firstAttribute="leading" secondItem="XWo-36-xGi" secondAttribute="leading" constant="33" id="Be1-9m-alA"/>
                 <constraint firstItem="n7q-ew-DYu" firstAttribute="top" secondItem="TMn-LX-3Ub" secondAttribute="bottom" constant="7" id="BtQ-PX-1e1"/>
                 <constraint firstItem="109" firstAttribute="leading" secondItem="XWo-36-xGi" secondAttribute="leading" constant="20" id="Cu9-uO-BZG"/>
+                <constraint firstItem="FCB-ax-ARZ" firstAttribute="top" secondItem="HaB-rc-AcW" secondAttribute="bottom" constant="6" id="EAW-lg-2pb"/>
+                <constraint firstItem="FCB-ax-ARZ" firstAttribute="leading" secondItem="HaB-rc-AcW" secondAttribute="leading" id="GjC-qu-Nxe"/>
                 <constraint firstItem="j8R-Hj-3dj" firstAttribute="top" secondItem="mzw-F2-aAQ" secondAttribute="bottom" constant="6" id="H9h-Dz-FOL"/>
                 <constraint firstItem="bE0-Lq-Pj7" firstAttribute="leading" secondItem="XWo-36-xGi" secondAttribute="leading" constant="20" id="KKo-uq-jJx"/>
                 <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="7z2-DD-c58" secondAttribute="trailing" constant="20" symbolic="YES" id="O2M-YY-tO1"/>
@@ -581,6 +593,7 @@
                 <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="mzw-F2-aAQ" secondAttribute="trailing" constant="20" symbolic="YES" id="vCa-4g-Zxq"/>
                 <constraint firstItem="uHU-aL-du7" firstAttribute="leading" secondItem="ETa-09-qWI" secondAttribute="trailing" constant="8" symbolic="YES" id="wZO-1b-2vC"/>
                 <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="13" secondAttribute="trailing" constant="20" symbolic="YES" id="yxg-7J-xR5"/>
+                <constraint firstItem="FCB-ax-ARZ" firstAttribute="trailing" secondItem="HaB-rc-AcW" secondAttribute="trailing" id="z0l-7W-j7D"/>
             </constraints>
             <point key="canvasLocation" x="-376" y="-618"/>
         </visualEffectView>
diff --git a/Source/WindowNIBs/en.lproj/frmPrefWindow.strings b/Source/WindowNIBs/en.lproj/frmPrefWindow.strings
index b831f26c..fea28f87 100644
--- a/Source/WindowNIBs/en.lproj/frmPrefWindow.strings
+++ b/Source/WindowNIBs/en.lproj/frmPrefWindow.strings
@@ -44,6 +44,7 @@
 "chkAutoCorrectReadingCombination.title" = "Automatically correct reading combinations when typing";
 "chkFetchSuggestionsFromUserOverrideModel.title" = "Applying typing suggestions from half-life user override model";
 "chkKeepReadingUponCompositionError.title" = "Allow backspace-editing miscomposed readings";
+"chkTogglingAlphanumericalModeWithLShift.title" = "Also toggle alphanumerical mode with Left-Shift";
 "chkUseFixecCandidateOrderOnSelection.title" = "Always use fixed listing order in candidate window";
 "DbW-eq-ZdB.title" = "Starlight";
 "dIN-TZ-67g.title" = "Space to +cycle candidates, Shift+Space to +cycle pages";
diff --git a/Source/WindowNIBs/ja.lproj/frmPrefWindow.strings b/Source/WindowNIBs/ja.lproj/frmPrefWindow.strings
index ad86232e..7e175bbc 100644
--- a/Source/WindowNIBs/ja.lproj/frmPrefWindow.strings
+++ b/Source/WindowNIBs/ja.lproj/frmPrefWindow.strings
@@ -44,6 +44,7 @@
 "chkAutoCorrectReadingCombination.title" = "入力中で打ち間違った発音組み合わせを自動的に訂正する";
 "chkFetchSuggestionsFromUserOverrideModel.title" = "入力中で臨時記憶モジュールからお薦めの候補を自動的に選ぶ";
 "chkKeepReadingUponCompositionError.title" = "効かぬ音読みを BackSpace で再編集";
+"chkTogglingAlphanumericalModeWithLShift.title" = "左側の Shift キーでも英数入力モードの切り替え";
 "chkUseFixecCandidateOrderOnSelection.title" = "候補文字を固定順番で陳列する";
 "DbW-eq-ZdB.title" = "星光";
 "dIN-TZ-67g.title" = "Shift+Space で次のページ、Space で次の候補文字を";
diff --git a/Source/WindowNIBs/zh-Hans.lproj/frmPrefWindow.strings b/Source/WindowNIBs/zh-Hans.lproj/frmPrefWindow.strings
index 4baf33f5..edc00b63 100644
--- a/Source/WindowNIBs/zh-Hans.lproj/frmPrefWindow.strings
+++ b/Source/WindowNIBs/zh-Hans.lproj/frmPrefWindow.strings
@@ -44,6 +44,7 @@
 "chkAutoCorrectReadingCombination.title" = "敲字时自动纠正读音组合";
 "chkFetchSuggestionsFromUserOverrideModel.title" = "在敲字时自动套用来自半衰记忆模组的建议";
 "chkKeepReadingUponCompositionError.title" = "允许对无效的读音使用 BackSpace 编辑";
+"chkTogglingAlphanumericalModeWithLShift.title" = "也允许使用左侧的 Shift 键盘切换英数输入模式";
 "chkUseFixecCandidateOrderOnSelection.title" = "以固定顺序来陈列选字窗内的候选字";
 "DbW-eq-ZdB.title" = "星光";
 "dIN-TZ-67g.title" = "Shift+Space 换下一页，Space 换选下一个候选字。";
diff --git a/Source/WindowNIBs/zh-Hant.lproj/frmPrefWindow.strings b/Source/WindowNIBs/zh-Hant.lproj/frmPrefWindow.strings
index 6110816e..bba14a11 100644
--- a/Source/WindowNIBs/zh-Hant.lproj/frmPrefWindow.strings
+++ b/Source/WindowNIBs/zh-Hant.lproj/frmPrefWindow.strings
@@ -44,6 +44,7 @@
 "chkAutoCorrectReadingCombination.title" = "敲字時自動糾正讀音組合";
 "chkFetchSuggestionsFromUserOverrideModel.title" = "在敲字時自動套用來自半衰記憶模組的建議";
 "chkKeepReadingUponCompositionError.title" = "允許對無效的讀音使用 BackSpace 編輯";
+"chkTogglingAlphanumericalModeWithLShift.title" = "也允許使用左側的 Shift 鍵盤切換英數輸入模式";
 "chkUseFixecCandidateOrderOnSelection.title" = "以固定順序來陳列選字窗內的候選字";
 "DbW-eq-ZdB.title" = "星光";
 "dIN-TZ-67g.title" = "Shift+Space 換下一頁，Space 換選下一個候選字";