There are attributes that may be defined on a global basis for keyboard navigation. The Agent/src/ file is the main keyboard navigation file. In it, you can set the following variables:
web-apps/Agent/script/keyboardNavigation.js
var _showNotificationWindow = true;
var _highlightAndFadePanels = true;
var _highlightAndFadeNodes = true;
_showNotificationWindow determines whether the small notification window that pops up in the bottom right part of the screen is shown when a shortcut is pressed. Each shortcut has an attribute called notify that specifies the use of the notification window on a shortcut-by-shortcut basis. However, the use of the notification window may be disabled if the _showNotificationWindow is set to false.
_highlightAndFadePanels provides a visual highlight as users jump from one panel to the next using the panel shortcuts (CTRL+, CTRL+. ALT+, ALT+.). When this attribute is set to false, the panel highlighting will not occur.
_highlightAndFadePanels provides a visual highlight as users tab throughout the Service Center. When this attribute is set to false, the screen elements will not be highlighted.
