Just to let ya'll know my thoughts on it:
It seems that as a "middle" or "gateway" tea (see 29 April, 5 & 9 May), it also made sense to brew it at the exact "middle" time for black and green teas. In other words: because black tea should be brewed for 3-5 minutes and green tea for 5-7, it made perfect sense to brew the Lapsang for 5 minutes.
The results were a bit mixed. The taste was a stronger than the usual, but still not overpowering. So, I think that practice may work in general for lighter black teas... if I find any others. :)
All the best,
P.S. -> A warm, happy birthday to Craig Deutsch!