I think that is a good idea to use a single user/password for: ftp, fog user, gui, mysql, and so .
there are much problem generated by password uncorrect. (and also forum posts).
We need that changing fog password via gui, also all other passwords are changed. More confortable.
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I really don't think this will be a good idea. Actually in most places this will be very restrictive, not mentioning insecure. Most people will assign different users, passwords and so on to different services, setting the same to all is not recommended for anyone.