[shovel]

Actually with the implementation of the hook/plugin system you can process PHP code dynamically through the AdminCP. Goto..

AdminCP -> Plugins & Products -> Plugin Manager

If you add a plugin, you can fire off from a selected hook. I believe the hook you want for the process on a new post which would be "newpost_process". The variable that contains the post content is $post['message']. If you modify the post message remember that you also need to reset it within the datamanager. So after you perform your process you must run..

PHP Code:

$dataman->setr('pagetext',$post['message'];