PHP INI Missing some things - How much is effected?

I'm on a managed wordpress host, WPMU, but I am thinking of adding XF 2.3 onto it, but during install it shows these:

Code:

Your server has disabled a core PHP function exec via the disable_functions directive in php.ini. This may cause unexpected problems in XenForo.
Your server has disabled a core PHP function escapeshellarg via the disable_functions directive in php.ini. This may cause unexpected problems in XenForo.
Your server has disabled a core PHP function proc_open via the...

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