just an idea about it..
On the Guild window, make a button called Blacklist/ignore. only master & officer allowed to access it & add/remove some blacklist/ignore name.
so, if a name listed on our guild blacklist, any Recruiter/officer/master cant invite him to guild.
and get a notice "you cant invite him, because he is a noob" *joke* hahaha and.....
thanks

sorry about my english