If you want to compare apples to apples I can see where you want to have a standard length track and timing trap, but if I had a car to run I would want to take maximum advantage of the track available to me.
Let's say the day comes when one of the really long runways becomes available would you just want to run a mile and then thru a trap??
The drag race guys have a standard and everything is compared to that standard and they race heads up. I thought we were interested in the top speed of a vehicle and would want to take advantage of all the track length we can get.
5 miles at B'ville is probably going to get that done for 95% of the cars/bikes that run there, but if there is more track available for the really fast cars I say give it to them. If you run FIA/FIM I don't believe there is any restrictions on the length of the course, just that you have to set your record over the same physical piece of ground and within one hour.
If you don't care or can't afford to run FIA/FIM then I believe the track being used should be setup to provide the opportunity for the highest possible speeds.
If you want to compare apples to apples two sets of lights could be used, say one trap at the one mile that would be used as a standard around the world (if the metric guys would go for it) and a second trap at the maximum safe distance for the particular track being used so you could try and run as fast as possible.
c ya, Sum