Martoccia,
Although I do donate a lot of time and energy into wpbook and wordpress I do have other obligations therefore if I don't respond right away it's not because your questions not important. Please remember that support on here is free and I'm willing to help but please be patient.
To answer your bullet questions you'll need to add a bit of styling to your css. I added the following to wpbook/themes/default/style.css:
ul.apple {
list-style-image: url(CircleBullet.gif);
list-style-type: none;
}
where CircleBullet.gif is this is the name of your image which for simplicity I placed inside of the default folder.
Next add the class of apples to the <ul> that is started before the recent post. This will be either in themes recent_post.php (wpbook prior to 1.2) or in index.php (v 1.2 on) that would make that bit of code look like this:
<ul class="apple">
<?php wp_recent_posts(10); ?>
</ul>
you can name the class anything you like but it should be a unique name I choose apple for example purpose.
We are currently working on adding categories and tags to wpbook for now you can style them just like in any other theme by using the Template_Tags for wordpress (http://codex.wordpress.org/Template_Tags)
The "Add to Profile" button can't be customized and is set by the users facebook language. This is a feature of Facebook and uses FBML look at the facebook resource here for more info on this tag: http://wiki.developers.facebook.com/index.php/Fb:add-section-button
Hope this helps.