With this plugin you can add new functions through admin menu, without editing your themes functions.php
Great idea for a plugin, however, I'm unable to edit the text area. I'm using WP 3.6 and my browser is Chrome.
Likely an issue related to no updates for over a year...
But this plugin provides a text=area to paste in your php. However you can't even place your cursor in the box to type or paste any code.
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