There are currently a couple of obstacles in the way of this.
1. If you are running a mod other than the default "usermaps" then no console log seems to be produced. Not sure if this is a game "feature", or something to do the the mods.
2, There is no "tell" feature to send a message to a particular player, so any B3 command output eg !help !list etc will be seen by the entire server.
If you are running a vanilla no mod server, then you are welcome to try this out. (You need to use the egg or source versions of B3 in order to do so). Its very rough at the moment and hasn't been tested beyond making sure that players auth OK and can send commands since we don't have a vanilla server to test it on. You can post any errors that you get here with the b3 log and I will take a look ans see if it can be sorted.