A board admin is what most other BBS programs call the board moderator. A board can have multiple board admins. A board admin's powers are limited to the board he is admin of. A board admin can edit, delete and approve posts by normal users, mark topics as protected or locked and delete topics. If the moderation system is active for a board, every post in that board has a score.
All users can set a score threshold in their profile.
Forum admins can set the default number of votes new users get, change this value for individual users, and set the starting score individual user's posts have. If the moderation system is to be used, the cronjob must be run to reset the users votes to their daily defaults. You should set up a policy for voters explaining what sort of posts should be moderated down, whether voters may moderate a single post more than once etc. Chances are that using the moderation system will start a flame war or two anyway. To reset the temporarily muted users, the nightly cronjob must be run.