The extension siteaccess settings makes it possible to place siteaccess specific settings in the extensions.

The directory structure must be as follows :
extension/<my_extension>/settings/siteaccess/<my_siteaccess>/<file.ini.append.php>

Example:
extension/ezno/settings/siteaccess/ezno/override.ini.append.php :

<?php /*
 
[article_full_ezno]
Source=node/view/full.tpl
MatchFile=article/full.tpl
Match[class_identifier]=article
Subdir=templates
 
*/ ?>

Note:
All settings except debug settings and including/activating extensions can be set this way.