I'd like moz to hire me as his new guitarist/bassist/keyboardist/cowriter. Not saying i have anything against the current band, i'd just love to work with them and have my name next to moz's in a songwriting credit.
I wouldn't change much about him I suppose, because a lot of his faults are what make him as interesting as he is. They're nothing too major, anyways, none that I can think of at least. That's probably a cliche answer but ooooh well. However, I'm not one of those people that think Moz is untouchable and can do no wrong, but ya know what I mean.