--- xfwm4/src/events.c	2017-03-26 20:43:26.677796197 -0700
+++ wm-test/xfwm4/src/events.c	2017-04-03 10:58:46.315811536 -0700
@@ -32,6 +32,7 @@
 #include <X11/Xutil.h>
 #include <X11/Xatom.h>
 #include <X11/extensions/shape.h>
+#include <X11/extensions/XInput2.h>
 
 #include <glib.h>
 #include <gdk/gdk.h>
@@ -952,6 +953,19 @@
         {
             workspaceSwitch (screen_info, screen_info->current_ws + 1, NULL, TRUE, ev->time);
         }
+        else if (ev->button == Button10)
+        {
+           /*
+            *  Consume the button event and perform an unconditional WS switch.
+            *  (This 'gamer mouse' button event will never be sent to a client.)
+            * 
+            *  TODO: make all of these 'button actions' configurable, so that a User can avoid this behavior.
+            *        When adding that feature also include 'Button11', 'Button12' ... through
+            *        at least 'Button15'. If the mouse has them, they WILL work.
+            */  
+            workspaceSwitch (screen_info, screen_info->current_ws + 1, NULL, TRUE, ev->time);
+        }
+
 
         else if (WIN_IS_BUTTON (win))
         {