Hi Schmoozer /img/vbsmilies/smilies/smile.gif
I'm sure the coffee experts will be along soon to give you a definitive answer. But I would ask myself if this is necessary. Because I don't have the time to dedicate to learn the art of roasting coffee beans I'll always be a newbie. But I've found that you develop flavors in coffee through several different means...and many times a certain bean may dictate what the best method of roast, grind and brewing method.
Instead of re-roasting a certain bean I would move to beans/
roasts that are a bit darker (or full bodied). If you have a bean that's a bit on the lighter side you can try different sized grinds and different brewing methods. Pay attention to the lighter fruit or spice flavors that may be in the coffee. Who knows...you may not like this particular brew for a morning cup of Joe, but it could be perfect for a lighter cup in the late evening.
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dan