Service plans define potential services, the Panel does not check if a service or a resource that a service plan should provide is actually available, whether in the system in general, or in your reseller subscription. For example, when creating a plan, you can select to allow subscribers SSH access to a server shell when [...]
You can adjust following settings of PHP in Plesk 10.
PHP handler type:
ISAPI (only on Windows): This mode uses less server resources, but a website is isolated only if it is operating in a dedicated IIS application pool.
Apache module (only on Unix): This mode uses less server resources, but it is the least [...]