If you want to customize the titles of the categories pages and not limit it to the name of the category you can use the following modification.
Example:
Category: Internet
Custom Title: Web resources.

Category: Employment
Custom Title: Find you next job

1.

In phpMyadmin, run the following mysql query:

ALTER TABLE `PLD_CATEGORY` ADD `CUSTOM_NAME` TEXT NULL ;

2.

OPEN /templates/Code/admin/dir_categs_edit.tpl

FIND:

{if $symbolic ne 1}
      <tr>

BEFORE THAT, ADD:

<tr>
<td class="label"><label for="CUSTOM_NAME">
Custom Name:</label></td>
<td class="smallDesc">
<input type="text" id="CUSTOM_NAME" name="CUSTOM_NAME" 
 value="{$CUSTOM_NAME|escape|trim}" class="text" />      
</td>
</tr>

3.

OPEN /admin/dir_categs.php

FIND

//Determine columns
$columns = array ('TITLE' => _L('Title'), 'TITLE_URL' => _L('URL Title'),
'DESCRIPTION' => _L('Description'), 'PARENT' => _L('Parent'),
'SYMBOLIC' => _L('Type'), 'STATUS' => _L('Status'),
'HITS' => _L('Hits'), 'DATE_ADDED' => _L('Date Added'));

REPLACE BY

//Determine columns
$columns = array ('TITLE' => _L('Title'), 'TITLE_URL' => _L('URL Title'),
'CUSTOM_NAME' => _L('Custom Name'), 'DESCRIPTION' => _L('Description'),
'PARENT' => _L('Parent'), 'SYMBOLIC' => _L('Type'), 'STATUS' => _L('Status'),
 'HITS' => _L('Hits'), 'DATE_ADDED' => _L('Date Added'));

4.
To add the custom category name in the page title or the body of the page, ADD {$category.CUSTOM_NAME|escape|trim}
to the appropriate template file (header.tpl, top_bar.tpl, main.tpl, …)