Set default formatting options in ExpressionEngine.

default_formatting.php

<?php

// Note that this has only been tested with the 2.1.5 beta

// Editing starts at line 3926 and goes until line 3963 of /system/expressionengine/controllers/cp/admin_content.php

// Start here:

// build list of formatting options
// (Add whatever additional formatting plugins you like here)
$vars['field_fmt_options'] = array(
	'none' => $this->lang->line('none'),
	'br' => $this->lang->line('auto_br'),
	'xhtml' => $this->lang->line('xhtml'),
	'format_characters' => 'Format Characters',
	'textile' => 'Textile',
	'valid_url' => 'Valid URL'
);

if ($type == 'new')
{
	$vars['edit_format_link'] = '';
}
else
{
	$confirm = "onclick=\"if( !confirm('".$this->lang->line('list_edit_warning')."')) return false;\"";
	$vars['edit_format_link'] = '<strong><a '.$confirm.' href="'.BASE.AMP.'C=admin_content'.AMP.'M=edit_formatting_options'.AMP.'id='.$field_id.'" title="'.$this->lang->line('edit_list').'">'.$this->lang->line('edit_list').'</a></strong>';

	$this->db->select('field_fmt');
	$this->db->where('field_id', $field_id);
	$this->db->order_by('field_fmt');
	$query = $this->db->get('field_formatting');

	if ($query->num_rows() > 0)
	{
		foreach ($query->result_array() as $row)
		{				
			if(!array_key_exists($row['field_fmt'], $vars['field_fmt_options']))
			{
				$vars['field_fmt_options'][$row['field_fmt']] =  ucwords(str_replace('_', ' ', $row['field_fmt']));
			}
		}
	}
}

// The above chunk of code replaces everything until this line:

$vars['field_fmt'] = (isset($field_fmt) && $field_fmt != '') ? $field_fmt : 'xhtml';

?>