Make guild bans possible. Add a "button" to ban a player from your guild. For example, if one member misbehaves and gets kicked, he can just change name and rejoin, or join with other characters. Therefore I'd like to be able to block any character that is on that person's account. Any character from that person that also is in the guild will be kicked and eventually blocked as well. With guild bans is possible to prevent many problems and it make difficult to a player to get revenge from inside the guild.
#Guild bans
drowsy obsidian
eager crystal
This is the whole reason I refuse to open my guild to the public. The fact there is no kept people from joining the guild after being kicked is just asking for trouble.