Re: Plugins Vs. MU-PLugins For BP PLugins
It really depends on the developer of the BP plugin in question.
The readme.txt that comes with the plugin is usually the best indicator of where to place the plugin.
There is a BuddyPress menu in the WPMU admin area, but it would be good to know what you mean by “and it sucks that I have to make changes every time there is a blog”.
Re: Pressbox theme… check out the default “bphome” theme, especially the functions.php file. You’ll probably want to copy over some of the functions into the Pressbox theme functions.php file.
Hope that helps in some way!