PHP Set-up

When installling PHP (version 5.2.6) on my server, there’s an option to enable 7 optional features:

Enable ‘exec’ function
Enable ‘popen’ function
Enable ‘passthru’ function
Enable ‘proc_open’ function
Enable ‘shell_exec’ function
Enable ‘system’ function
Enable ‘allow_url_include’ feature

Are any of these needed for WordPress 2.7.1 to function properly? I’ve just been testing so far and it seems to work smoothly. Given that they can introduce possible security holes, I’d prefer not to have ’em active unless I needed to.

Thanks.