title: Using AdditionalConfiguration.php for many TYPO3 Installation?
body: <p>I use one global AdditionalConfiguration.php for serveral TYPO3 Installation. I just symlink this file.</p>
  
  <pre><code>AdditionalConfiguration.php -&gt; /global/typo3_every_instance/typo3conf/AdditionalConfiguration.php
  </code></pre>
  
  <p>Now in this AdditionalConfiguration.php I can enforce the use of rsa for every TYPO3 Instance:</p>
  
  <pre><code>$GLOBALS['TYPO3_CONF_VARS']['BE']['loginSecurityLevel'] = 'rsa';
  </code></pre>
  
  <p>I too have a configuration for maxFileSize there:</p>
  
  <pre><code>$GLOBALS['TYPO3_CONF_VARS']['BE']['maxFileSize'] = '20240'
  </code></pre>
  
  <p>But on some installation I want to have a bigger maxFileSize, so I have this in my LocalConfiguration.php:</p>
  
  <pre><code>'BE' =&gt; array('maxFileSize' =&gt; 150000)
  </code></pre>
  
  <p>Now I changed the  AdditionalConfiguration.php to:</p>
  
  <pre><code>/* if not set in LocalConfiguration maxFileSize has default value */
  if($GLOBALS['TYPO3_CONF_VARS']['BE']['maxFileSize'] == '10240'){
     $GLOBALS['TYPO3_CONF_VARS']['BE']['maxFileSize'] = '20280'; // 10MB
  }
  </code></pre>
  
  <p>What to you think about this?</p>