Added a setting, LiruMouselookMenu, in case people don't want this feature.

indra/newview/app_settings/settings.xml

@@ -786,6 +786,17 @@
       <key>Value</key>
       <integer>0</integer>
     </map>
+    <key>LiruMouselookMenu</key>
+    <map>
+      <key>Comment</key>
+      <string>Controls if holding Alt and right clicking in mouselook will bring up a menu</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <boolean>1</boolean>
+    </map>
     <key>LiruNewARCLimit</key>
     <map>
       <key>Comment</key>

indra/newview/lltoolcomp.cpp

@@ -764,7 +764,7 @@ BOOL LLToolCompGun::handleRightMouseDown(S32 x, S32 y, MASK mask)
 	// be shown.
 	return FALSE;
 	*/
-	if (mask & MASK_ALT) return false;
+	if (gSavedSettings.getBOOL("LiruMouselookMenu") && mask & MASK_ALT) return false;
 
 	// Returning true will suppress the context menu
 	return TRUE;