All tables (lists and related lists) hightight current row on hover. Hover over a row and the background turns white.

ansibleworks/ui/static/js/lists/Credentials.js

@@ -17,7 +17,7 @@ angular.module('CredentialsListDefinition', [])
         selectInstructions: 'Check the Select checkbox next to each credential to be added, and click Finished when done. Use the green <i class=\"icon-plus\"></i> button to create a new user.', 
         editInstructions: 'Create a new credential from either the Teams tab or the Users tab. Teams and Users each have an associated set of Credentials.',
         index: true,
-        index: true,
+        hover: true,
         
         fields: {
             name: {