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I seldom bump start over 20 mph and usually less and always in 5th if coasting to a stop. I will briefly bump just before applying the breaks the car is an easy starter, very smooth. The car will momentarily rev to 1500 rpms then settle down to idle. The wear was a concern but the car is designed to pull the car from a dead stop in 1st at start up. I think the low speed bump is about equivalent, but I am no engineer, but you are trying to get all that weight moving (in a 1st gear start) as opposed to over coming compression and a much smaller weigh in the spinning mass of the engine. I'm sure one of you engineer types could come up with the forces involved, 1st gear start vs low speed bump start in 5th. How much load the clutch carry for each. The only difference I see is the change in direction the load is applied which may be designed into the clutch, it may be designed for 1st gear starts and not for bump starting, again no engineer here.
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