This interesting article outlines this dean's general objections to 'early tenure' and ends with a list of 3 criteria he uses for making an exception to the rule.
What was interesting to me, though, was his reaction to a candidate for a tt job who asked him about the prospects of early tenure during the interview. This dean's response was to see the candidate as presumptuous and even to now be concerned that this candidate will be a 'problem' a few years down the line. So, note to candidates, don't ask about early tenure during the first interview with the dean. At least to the dean who wrote the article, you will come off as presumptuous and as a potential troublemaker:
http://chronicle.com/jobs/news/2008/04/2008042101c/careers.htmlActually, it reminds me a bit of my rant about "I'll do anything to get an A" from students who come especially before the first assignment has been given--I sensed the same wariness and frustration in the dean's attitude: Here you are, you haven't even been offered or started the job yet and you are talking about early tenure and asking me about 'the process' involved. Get back in line!