You can add more space between categories by going to your forumhome_forumbit_level1_nopost template
and changing
Code:
<div class="tcat_main">
to
Code:
<div class="tcat_main" style="margin-top: 15px;">
Then you can adjust the 15px to whatever suits your needs.
As for the navigation items in the black navbar, unfortunately there are no psd files, so unless you recreate the button links in the navbar, you will have to leave your navbar additions to the traditional navbar below the navbits. If you have the ability to recreate the black navbar buttons, let me know and I'll walk you through adding additional links.