I notice that when a enemy's sight cone briefly 'flashes' as they turn around and clips you, it does not trigger your stealth to break, but if you so long stand for 0.5 seconds in it, your stealth breaks almost immediately.

Is there a way to tweak that timer so higher stealth skill increases how long you can stay inside the cone by +0.3 ingame turns per skill points? (It takes roughly 3-5 seconds for 1 turn for buffs to revolve to a complete end).

So at max skill at stealth you get about 2.5 to 3 seconds of leeway before your stealth breaks inside the cone, allowing you to briefly sneak across cone of sights.