My thoughts :
1.) Good idea - Not many people use this option
2.) Good idea - Tie it in with my following suggestion

3.) How about 2 - 1 "Personal" Journal, 1 "Public" Journal - Then let them choose what format their journal takes, either Public or Private, and create a 2nd thread with the alternate state
4.) Good idea
5.) As with 3, allow all paid users to view & reply to Public Journals (allow journal creator to delete entries they dont like - You could also allow them to "Ban" users from their Public Journal), but only allow Admins mods and the thread creator to view their own private journal
IMO, the only things that should be censored are things which are illegal, like child pornography or things regarding warez
Satan