diff --git a/MiddleClick.xcodeproj/project.pbxproj b/MiddleClick.xcodeproj/project.pbxproj
index f21b797..e56e08f 100644
--- a/MiddleClick.xcodeproj/project.pbxproj
+++ b/MiddleClick.xcodeproj/project.pbxproj
@@ -32,6 +32,7 @@
 		75A6B69C0FEE90530071FAC0 /* ApplicationServices.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ApplicationServices.framework; path = /System/Library/Frameworks/ApplicationServices.framework; sourceTree = "<absolute>"; };
 		8D1107310486CEB800E47090 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = Info.plist; path = MiddleClick/Info.plist; sourceTree = "<group>"; };
 		8D1107320486CEB800E47090 /* MiddleClick.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = MiddleClick.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		9753175829D5983E0065CAA7 /* PreferenceKeys.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = PreferenceKeys.h; path = MiddleClick/PreferenceKeys.h; sourceTree = "<group>"; };
 		FAD94F9210A88A7800A520EC /* Controller.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Controller.h; path = MiddleClick/Controller.h; sourceTree = "<group>"; };
 		FAD94F9310A88A7800A520EC /* Controller.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Controller.m; path = MiddleClick/Controller.m; sourceTree = "<group>"; };
 /* End PBXFileReference section */
@@ -105,6 +106,7 @@
 				FAD94F9210A88A7800A520EC /* Controller.h */,
 				FAD94F9310A88A7800A520EC /* Controller.m */,
 				29B97316FDCFA39411CA2CEA /* main.m */,
+				9753175829D5983E0065CAA7 /* PreferenceKeys.h */,
 			);
 			name = "Other Sources";
 			sourceTree = "<group>";
diff --git a/MiddleClick/Controller.m b/MiddleClick/Controller.m
index b849807..75dbf9c 100644
--- a/MiddleClick/Controller.m
+++ b/MiddleClick/Controller.m
@@ -1,4 +1,5 @@
 #import "Controller.h"
+#import "PreferenceKeys.h"
 #include "TrayMenu.h"
 #import <Cocoa/Cocoa.h>
 #include <CoreFoundation/CoreFoundation.h>
@@ -66,7 +67,7 @@ - (void)start
   threeDown = NO;
   wasThreeDown = NO;
   
-  fingersQua = [[NSUserDefaults standardUserDefaults] integerForKey:@"fingers"];
+  fingersQua = [[NSUserDefaults standardUserDefaults] integerForKey:kFingersNum];
   
   NSString* needToClickNullable = [[NSUserDefaults standardUserDefaults] valueForKey:@"needClick"];
   needToClick = needToClickNullable ? [[NSUserDefaults standardUserDefaults] boolForKey:@"needClick"] : [self getIsSystemTapToClickDisabled];
@@ -270,16 +271,19 @@ int touchCallback(int device, Finger* data, int nFingers, double timestamp,
                   int frame)
 {
   NSAutoreleasePool* pool = [NSAutoreleasePool new];
-  fingersQua = [[NSUserDefaults standardUserDefaults] integerForKey:@"fingers"];
+  fingersQua = [[NSUserDefaults standardUserDefaults] integerForKey:kFingersNum];
+  float maxDistanceDelta = [[NSUserDefaults standardUserDefaults] floatForKey:kMaxDistanceDelta];
+  float maxTimeDelta = [[NSUserDefaults standardUserDefaults] integerForKey:kMaxTimeDeltaMs] / 1000.f;
   
   if (needToClick) {
     threeDown = nFingers == fingersQua;
   } else {
     if (nFingers == 0) {
+      NSTimeInterval elapsedTime = touchStartTime ? -[touchStartTime timeIntervalSinceNow] : 0;
       touchStartTime = NULL;
-      if (middleclickX + middleclickY) {
+      if (middleclickX + middleclickY && elapsedTime <= maxTimeDelta) {
         float delta = ABS(middleclickX - middleclickX2) + ABS(middleclickY - middleclickY2);
-        if (delta < 0.4f) {
+        if (delta < maxDistanceDelta) {
           // Emulate a middle click
           
           // get the current pointer location
@@ -304,7 +308,7 @@ int touchCallback(int device, Finger* data, int nFingers, double timestamp,
     } else {
       if (maybeMiddleClick == YES) {
         NSTimeInterval elapsedTime = -[touchStartTime timeIntervalSinceNow];
-        if (elapsedTime > 0.5f)
+        if (elapsedTime > maxTimeDelta)
           maybeMiddleClick = NO;
       }
     }
diff --git a/MiddleClick/PreferenceKeys.h b/MiddleClick/PreferenceKeys.h
new file mode 100644
index 0000000..b5cc81d
--- /dev/null
+++ b/MiddleClick/PreferenceKeys.h
@@ -0,0 +1,12 @@
+// The number of fingers needed to simulate a middle click.
+#define kFingersNum @"fingers"
+#define kFingersNumDefault 3
+
+// The maximum distance the cursor can travel between touch and release for a tap to be considered valid.
+// The position is normalized and values go from 0 to 1.
+#define kMaxDistanceDelta @"maxDistanceDelta"
+#define kMaxDistanceDeltaDefault 0.4f
+
+// The maximum interval in milliseconds between touch and release for a tap to be considered valid.
+#define kMaxTimeDeltaMs @"maxTimeDelta"
+#define kMaxTimeDeltaMsDefault 500
diff --git a/MiddleClick/TrayMenu.m b/MiddleClick/TrayMenu.m
index 8eeae94..c3929b5 100644
--- a/MiddleClick/TrayMenu.m
+++ b/MiddleClick/TrayMenu.m
@@ -1,4 +1,5 @@
 #import "TrayMenu.h"
+#import "PreferenceKeys.h"
 #import "Controller.h"
 #import <Cocoa/Cocoa.h>
 
@@ -74,7 +75,7 @@ - (void)setChecks
   bool clickMode = [myController getClickMode];
   NSString* clickModeInfo = clickMode ? @"Click" : @"Click or Tap";
   
-  int fingersQua = (int)[[NSUserDefaults standardUserDefaults] integerForKey:@"fingers"];
+  int fingersQua = (int)[[NSUserDefaults standardUserDefaults] integerForKey:kFingersNum];
   
   [infoItem setTitle:[clickModeInfo stringByAppendingFormat: @" with %d Fingers", fingersQua]];
   [tapToClickItem setState:clickMode ? NSControlStateValueOff : NSControlStateValueOn];
diff --git a/MiddleClick/main.m b/MiddleClick/main.m
index df32285..66e0733 100644
--- a/MiddleClick/main.m
+++ b/MiddleClick/main.m
@@ -1,10 +1,24 @@
 #import "Controller.h"
+#import "PreferenceKeys.h"
 #import "TrayMenu.h"
 
 int main(int argc, char* argv[])
 {
+  id keys[] = {
+    kFingersNum,
+    kMaxDistanceDelta,
+    kMaxTimeDeltaMs,
+  };
+  id objects[] = {
+    [NSNumber numberWithInt:kFingersNumDefault],
+    [NSNumber numberWithFloat:kMaxDistanceDeltaDefault],
+    [NSNumber numberWithInt:kMaxTimeDeltaMsDefault],
+  };
+  NSUInteger count = sizeof(objects) / sizeof(id);
   NSDictionary *appDefaults = [NSDictionary
-                               dictionaryWithObject:[NSNumber numberWithInt:3] forKey:@"fingers"];
+                               dictionaryWithObjects:objects
+                               forKeys:keys
+                               count:count];
   
   [[NSUserDefaults standardUserDefaults] registerDefaults:appDefaults];