a diacetyl rest is one of the easiest things we can do to our beers...and it is also very benign...so the answer is always...it doesn't hurt a beer if you do one when it doesn't really need one...so there is really no point in NOT doing one...it is also the most simplest thing you can do...with lagers I usually just factor it into the time when I rack it into a secondary to lager...I rack, then rest it for 73 hours (or rest hen rack...it really doesn't matter) at room temperatures and then take it back down to lager temps....
If you have any more questions, look at this definitive thread on d-rests. http://www.homebrewtalk.com/f13/prev...ghlight=butter
It's one of those brewing practices like using a hydrometer or sanitizing...there is really no reason to question the validity of doing it...and it doesn't hurt the beer,,,so there is no point in NOT doing it.
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