When I have to go to http://www.bugmenot.com/ , input the name of your forum, and possibly have to complete a signup myself, in order to post, that is the exact opposite of minimalism. It's a hassle. It's annoying and stupid.
There are many reasons why not to use registration:
http://shii.org/shiichan
and no reason to use it, except maybe to give special privileges to certain users who are your friends.
So, my feature request is to stop making "Username" a required field to post (it's easy... just make it replace a blank username with Anonymous), and to enable guest posting by default.