MCBans is a plugin for server staff to assist and manage a server, some servers will not want to slap users in the face with it, and thus it would be a good idea to allow the plugin to run on silent mode, that is no messages or warnings to users on join.

That includes messages like "You have bans on record!".

Will be added for MCBans 3.3

Yes, this would be nice. There is an option to hide the 'Server secured by MCBans.com!' message, but nothing to hide player ban notices.