I don't understand what you mean by 'focus follows mouse issue'. Please explain more, maybe there's a solution to that (whatever that issue is!)
Steve Yegge mentioned in a rant[0] a while back.
[0] http://steve-yegge.blogspot.co.uk/2008/04/settling-osx-focus...
I have to say I like OS X's behavior much much more. Directing key strokes to a window that my mouse just happens to point to would be very confusing (to me at least).