The most important "freedom" is the freedom to express one's views without concern over censorship. The rest of it is lights, bells and whistles, which to this point, I haven't paid much attention to on any board. I guess this is a holdover from my earliest chat experiences on the 'net. IRC, or Internet Relay Chat is a real-time text only communication protocol popular in the early days of the Internet. All you had to work with was your written word and a few basic ASCII emoticons, so I became comfortable with that.
Having operated a few IRC channels back in the day, I understand and agree with the need for some moderation, personal attacks and insults for example should not be tolerated. However, some of Sci Fi's board moderators had this nasty habit of censoring based on disagreement with the content of a post, such as criticism of SciFi shows or different political views. And politics can't really be kept entirely out of boards; politics is the process by which a society makes its decisions, and in particular discussions about science fiction stories since those stories often ask us to examine our own political beliefs; Continuum is a very good example of this; one of the better plots of the show is Kiera's slow awakening that most of what she has believed all her life is wrong. If someone goes over the line of civility by using personal insults and such, that content should be deleted upon detection, but as long as someone keeps a civil tongue in their head, their views should not be grounds for censorship. This was a big problem on SciFi's boards, but it may have been at the direction of NBC/Universal or whatever other corporate entity paid for the party, since most of the mods demonstrated this behavior, some more than others.
Hopefully, this board offers that kind of Freedom.