Problem:
The duration of the reload procedure is extremly short when you are adding a magazine to your empty weapon while you are prone.
Occurence:
Occures only at the first execution after you switched to the prone stance.
Coverage:
Only tested with one assault rifle so far. {F19722}
With version 0.6* occurence changed:
step 1 - 3: still the same
step 4:
method 'a' wont work anymore
method 'b' and 'c' still work
singleplayer mission for fast reproduction added (ignore the mission name ;) )
Added: You can also effectively "reload cancel" by doing urban prone sideways (not down), and hitting "reload" right after starting to move back to "normal" prone. After the animation finishes, your empty weapon will be reloaded again, cutting reload time depending on the weapon down to about 1/2 seconds.
I'm calling this fixed. I think the others are on purpose and not feasible for an exploit.