#2: Good idea with the nav, resolved this one, thanx! 
I only need to know where bb_topic_admin(); leads to…
#1: This is not supposed to happen, unless my integration went wrong, but that is a different topic.
Again, thanx for your help guys! 
pxlgirl.
Problem 1: Might be a problem with cookies. The members link on the navi appears as selected, although I’m not on the members page, but the forums, which is not selected at all. Here’s a part of my header.php of the bb theme template:
<?php if ( function_exists( 'bp_blogs_install' ) ) { ?>
<li<?php if ( bp_is_page( BP_BLOGS_SLUG ) ) {?> class="selected"<?php } ?>><a href="<?php echo get_option('home') ?>/<?php echo BP_BLOGS_SLUG ?>" title="<?php _e( 'Blogs', 'buddypress' ) ?>"><?php _e( 'Blogs', 'buddypress' ) ?></a></li>
<?php } ?>
<li<?php if ( bp_is_page( 'forums' ) ) {?> class="selected"<?php } ?>><a href="/bbpress/" title="Forums">Forums</a></li>'
I used the default template and moved some code around.
Problem 2: I think a pic says more than a 1000 words here: http://yfrog.com/56screen1opj I want to get rid of those “[]” and I have no idea in which file to do that.
pxlgirl.
Problem #3 is solved, only #1 and #2 remaining… Ideas anyone?
pxlgirl.
Update:
I’ve been moving around some function calls and css attributes, things almost work except 3 things:
1. The navigation shows “members” as selected page, not the forums. How can I solve that? To implement the forum link on bbpress, I’ve created a file called pb_nav.php and put it in my mu-plugins/ dir. This won’t work on bbpress for whatever reason
2. When viewing a topic, I got some admin options at the bottom, such as “Delete topic”, “Unstick topic” etc. All these options are put in “[…]” which looks awful. I have no idea what in what file I can remove them.
3. I’d also like to change the “welcome <username> | Admin | log out” part by removing the username part, where is that declared?
I’d be happy if someone would help me out here, I’m almost getting to there…
pxlgirl.
I guessed I’ll have to do that, but I have no idea which files I need to edit. The bbpress header file looks so much different from the wp file. It works somehow on the buddypress page. I want the same for me 
Another option might be, that I just work on the existing bbpress theme and try to adjust the design as good as possible. I’d be happy to be able to load my buddypress navigation at least, the rest can be done with using the local css files. Other good ideas are welcome.
pxlgirl.
Registrations are enabled via my wpmu for now, but this will be disabled after I launch the site. You won’t get 100% security of course, but at least it would decrease unwanted user registrations. I’ll check some bbpress plugins due to spam protection.
pxlgirl.
I closed the registrations the brutal way. I removed all <form></form> in register.php and added a message instead. Quick and dirty, but effective since I’m using bbpress with wpmu+buddypress, so users don’t need to register in the forums.
pxlgirl.
