BH time trials just sort of faded away; last year we regularly had <5 riders, so it it didn't make sense to the folks putting in the hours to set it up. Many reasons for that, a better discussion for sitting around after riding than here.
My recollection is the short tracks were Lemans start, the long routes were 15 second interval starting. Short tracks were probably 4-8 minute laps for the leaders (20- 30 minute races). Long routes were 10-18 minutes (usually two laps, though sometimes three on a shorter course). I always liked to get at least a thirty minute race, but that wasn't always the case.
There was always a no-drop pre-ride lap.
15 second starts work fine, and there is no real need for a timer; last to start starts the watch, first to finish starts recording times. If you can talk someone into not riding, it is a little easier, but I always felt bad for that person.
The advantage of BH is it easier to vary the course. The disadvantage (aside from membership) is that someone needs to set the course.
Number plates help, but riders can just say their names as they finish, so they aren't needed.
It is a fun way to be competitive yet relaxed; depending on how often you ran it, I would be a little worried about getting bored at QR. Not alot of ways to vary the course.
The last two years we occasionally did a team time trial, which was the most fun I ever had competing on a bike. It takes a little more time to run, though, so the evenings are too short now. Might work on a weekend, but it seems like there is an event every weekend into November at this point, and I know there is some trail to be built as well. Maybe next year.