Preset controls:

Example presets only add quick cast to 1-5 keys for tweaked preset and to 3-7 for vanilla preset, no other changes.
You can safely rearrange sign keys and change sword binds, but changing Cast Sign key (default Q) will cancel the tweak.

Tweaked:
 1 - Yrden cast
 2 - Quen cast
 3 - Igni cast
 4 - Axii cast
 5 - Aard cast
 6 - steel sword
 7 - silver sword
Rest is default.

Vanilla preset (with quick cast only added, no other changes):
 1 - steel sword
 2 - silver sword
 3 - Aard cast
 4 - Yrden cast
 5 - Igni cast
 6 - Quen cast
 7 - Axii cast
Rest is default.


Installing presets:

• Go to your Documents/The Witcher 3 folder
• IMPORTANT (if you don't want to lose your current binds): Back up your input.settings: rename input.settings file to input.settings1 (or whatever you want), in case you want to revert to your previous binds
• Copy my preset to Documents/The Witcher 3 folder
  

Uninstalling presets:

• Delete my input.settings
• Rename your backup to input.settings to revert to your previous keybinds
  
  

OR

• Open the game
• Go to Options > Key Bindings
• Press [R] to revert to default binds
  

If something goes wrong aka "waaah ur mode break muh gaem":
Don't panic. Just delete input.settings, launch the game and it will generate a new one.

Don't worry if it looks difficult, it's actually really easy and straightforward, just follow the steps and you'll be done in 10 minutes or less.

1. Open up the game, go to options > keybinds and assign your sign selection keys (for example let's use 1, 2, 3, 4 and 5), and your cast sign key
2. Close the game and open notepad
3. In an empty text file, we need to build the Wall of Text using this template 5 times, one time for each sign:

First line makes the sign cast with 0.001 sec delay (tapping

button is enough, it's just for sign to cast after selection),
and the second one is for alternative sign mode (holding).

"IK_?=(Action=CastSign,State=Duration,IdleTime=0.001)
IK_?=(Action=CastSignHold,State=Duration,IdleTime=0.2)"

Where ? is your keybind for sign selection bind you've assigned in step 1.
You need to use this template 5 times, for each sign selection keybind you've assigned.


Result example:


5. So now, when you have your Wall of Text, you need to make it even bigger, by copying it three times, under these three categories:
[BASE_Signs]
[Combat]
and
[Exploration]

So in the end your Wall of Text looks like this:

6. And finally - let's add this to the game.
Go to your Documents/The Witcher 3 folder and open the input.settings file with notepad.
Now you need to copy your result of step 5 to the very beginning of input.setting file and save it.
(Optional) Set input.settings to read only, because game started to revert to default keybinds in 1.07 for no apparent reason.

And that's it, now you can load the game up and see for yourself how much quick casting changes the gameplay.