How do I check "just fell off" state of a platform object?

There's this nice little functionality in the platform behaviour that allows an object to jump right after it's fallen off a platform ledge. Very handy as it means precision jumps are more forgiving. My question is, is there any way to read this "just fell off but can still jump"-state from events? The same way we can check "platform - is on floor"? Also, can we tweak how sensitive it is?

I've been working with this lately, after reading this article: http://www.gamasutra.com/blogs/YoannPignole/20140103/207987/Platformer_controls_how_to_avoid_limpness_and_rigidity_feelings.php. Here's what I did to make a "Tolerance jump":

Global number Jump_Tolerance = 0

(Invert) Platform is on floor Trigger once
• Set Jump_Tolerance to 1
• Wait (however many) seconds
• Set Jump_Tolerance to 0

Platform is on floor
• Set Jump_Tolerance to 0

Jump_Tolerance = 1
• Do stuff
• Set Jump_Tolerance to 0

Here's a .capx: https://drive.google.com/open?id=0B9cfa ... lEwa0RJODg

I'm actually trying to figure out how to allow for a "tolerance double jump", when double jump is enabled...

Cheers, that looks like a neat solution Good article too!