To set custom PHP Environment Variables such as register_globals, display_errors, max_execution_time, etc you will need to do so in a .htaccess file instead of a custom php.ini. We've found that this is a much better solution as any settings in a .htaccess file will affect directories and files under that folder as well instead of needing to put a custom php.ini in each and every folder.
You'll need to make changes to the variables using the "php_value" and "php_flag" directives and here are a few examples of what you will place into your .htaccess file:
php_flag display_errors off php_flag log_errors off php_value max_execution_time 3000 php_value memory_limit 128M php_value upload_max_filesize 256M php_value post_max_size 256M
Essentially anything that you can turn ON/OFF you'll want to use php_flag and anything where you will set a specific value you'll want to use php_value. If you have any questions or issues with this by all means feel free to open a support ticket and we'll be more than happy to help.