@szed
Use the plugin I mentioned above and modify it like like so:
In line 84-86 in bp-activity-as-shortcode.php you will see:
<?php if($title): ?>
<h3 class="activity-shortcode-title"><?php echo $title; ?></h3>
<?php endif;?>
Just above that add this:
<?php if ( is_user_logged_in() ) : ?>
<?php locate_template( array( 'activity/post-form.php'), true ); ?>
<?php endif; ?><br />
Use the shortcode in your post or page and you are done and the post form will be included. Make sure you study the parameters you can use with the shortcode on the plugins page!
