Description:
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As many big web-hosting companies do, I have my Apache httpd.conf file setup as a dynamic virtual host, rather than individual <VirtualHost> entries in the file. Which in turn causes me a problem when I try to enable safe mode and set the include/base_opendir settings.
The reason this is a problem is that as far as I can tell, there is no coding ability for the php_admin_value/php_value directives within the .conf/.htaccess files. I am hoping there is something I don't know about this issue, or hopefully a PHP project person considers this feature worth putting into the next PHP upgrade.

Reproduce code:
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example of how code could look if having mod_rewrite style variables available.

calling http://www.domain.com
php_admin_value open_basedir ${DocumentRoot}
result setting open_basedir = /www/d/domain.com

or with Apache 2.0's mod_vhost_alias style coding

calling http://domain.com
php_admin_value open_basedir /www/%1.1/%1+/
result setting open_basedir = /www/d/domain.com