I think that it is not the same thing to be in the position number 12 that to be in the position 120.
In the "S2 Hotlaps" -> "Racer details" your hotlaps are compared only with the best times (the benchmark is the 103% of the WR), with the new column you could compare your hotlaps with all the hotlaps uploaded without having to look the "S2 Hotlaps" -> "Hotlaps charts".
It could have this structure:
[ position in hotlap chart / total positions in hotlap chart ]