KOS binds and my problems with them

[Kuro]

I have two main points here in regards to the use of killbinds

My point against killbinds

Kill binds are insanely easy they are to use, making them the only effective way to play the game.

I mostly use my microhpone, you will hardly if ever catch me pausing to type anything mid-round.

That being said I HAVE to use a killbind because of how simple and easy it is to do. Point, click, done. There are times I will look at someone, turn around, walk away and get shot in the back 4+ seconds later and be able to call them out.
There are even times where I die before even pressing the button but the callout shows up in chat anyway (in yellow).

It completely ruins the game to the point I feel like it's mandatory to buy disguisers every round to disguise as I shoot someone to even stand a chance.

My point for killbinds

Due to the insane TTK, at any given moment you can be dead before you can even say anything.

In a game where a lot of the guns kill you in a fraction of a second it makes sense to have a way to communicate quickly before you die.
There's so many good players that one solid hard counter is needed for new players, so a killbind that anyone can use.  

My preferred solution would be reducing the amount of time you can actively call someone out after seeing them, 5 seconds is an extremely long time after losing sight of a person to call them out. I'd like if it were reduced to 3, 2, or even 1 second. It would still keep callout binds effective that way.

My other problem would be rules-wise as I'm pretty sure the only internal way to prove a KOS is called is via chat, anything in voice can be missed and there are no voice logs so if you're not recording you are basically fucked under most circumstances if you follow a KOS via voice and it leads to RDM but nobody else hears it.