Inserting custom fields using quick press

Hello,

i’m attempting to modify quick press so that we can enter the custom fields ‘Start Date’, ‘End Date’ and so that we can assign the category when a new post is added. I have successfuly added the form fields using the code below.

function __quickpress_custom() {
	if(!function_exists('is_admin') || !is_admin()) return;
	// Parameters for wp_dropdown_categories

echo '

    <div>
    <select name="category[]" size="10" MULTIPLE>';

    foreach(get_categories() as $cat)
{
    echo '<option value="'. $cat->cat_ID . '">'.$cat->cat_name.'</option>';
}
  echo  '
      </select>
</div>

    <div>
	<h4 id="custom-label" style="float: none; display:block; width: 103px; margin: 0 0 10px -27px;"><label for="post_custom">Custom Fields</label></h4>
	</div>
        <div style="margin:0px 0px 10px 0px;">
	<label>End Date</label>
        <input type="text" name="end-date" >
	</div>
        <div style="margin:0px 0px 10px 0px;">
	<label style="display:block; margin:15px 0px 5px 0px;">Hide Main image</label>
        <input type="radio" name="main-image" value="yes" />Yes
        <input type="radio" name="main-image" value="no" checked="checked" />No
	</div>
        <div style="margin:0px 0px 10px 0px;">
	<label>Start Date</label>
        <input type="text" name="start-date">
	</div>
	<div class="hide-if-no-js" style="margin: 0 0 .5em 5em;padding:8px 10px 5px 5px;">
	';
	return;
}
if(is_admin() || $query->is_admin) {
	$here = array( basename($_SERVER['REQUEST_URI']), basename($_SERVER['SCRIPT_FILENAME']) );

	 	if( ( $here[0] == 'index-extra.php?jax=dashboard_quick_press'  || $here[0] ==  'post.php') && ( $here[1] == 'index-extra.php'  || $here[1] == 'post.php') ) {
		add_action('media_buttons','__quickpress_custom');
	}

	unset($here);
}

The problem is actually getting the fields custom field data to register when the post is created. i have tried using the hooks wp_insert_post, quick_edit_custom_box and publish_page with a custom built function wich utilizes the wp_update_post() function. When it runs with the wp_update_post() it goes into a permanent loop. I’ve pretty much tried everything else i can think of. There doesn’t appear to be any info on the codex etc regarding this as i have had a good look. has anyone attempted the same thing and can anyone suggest a solution?

Thanks