Physics bug messing with leaderboards

There's a bug in the jump/fluffy physics that let you gain height while standing/jumping on top of a safe/chair/table/anything else of that weight.

Stand on top of the object, look straight down

1 switch to fluffy
2 jump
3 click object
4 turn off fluffy
5 repeat

Here's an auto-hotkey script for easy abuse (bound to 'g')

g::
Send e
sleep 80
Send {Space}
sleep 20
Click 
sleep 20
Send e
return