php_admin_* directives in a phpSuExec environment

Hello, Is there anyway to prevent users from modifying limits imposed by php.ini configuration in a phpSuExec configured PHP installation?? For example in server with PHP running in a module, I use php_admin_* directives: php_admin_value memory_limit 40M And users can't modify them from .htacess (php_value memory_limit 40M) or in a script: ini_set("memory_limit","40M"). This doesnt work in a phpSuExec enviroment.. I can modify those limits with a php.ini file or with a script :-( Is there anyway to prevent this?? Thanks Regards, -- Santi Saez