This is a mod to enable doing heavy strikes (both sword and fist) with only the right mouse button (no more alternate key), while preserving the functionality of guard and riposte/counter-attack. It can be installed simply with two versions, depending on your preference. The first only adds heavy attack functionality to the right mouse, and doesn't effect the specials or riposte/counter-attack command. The second version adds special attack (ie Rend) to holding the right mouse button, and switches the guard/riposte(counter-attack) key to 'e' while in combat.

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Install v.1 ***REGULAR MOD***:

0. Consider installing the mod "Script Merger", if you haven't already, and install it that way. Mod URL is at the bottom.
1. Extra "modRightMouseHeavy" from the .zip file into the folder [Witcher 3]\mods
2. Navigate to where input.settings is saved, containing your keybinds. It's probably in "My Documents\The Witcher 3" or "C:\Users\[User Name]\Documents\The Witcher 3
4. Make a backup of input.settings
3. open input.settings using notepad
4. Paste the following into the very top of input.settings:

[Combat]
IK_RightMouse=(Action=AttackHeavy)

[Combat_Replacer_Ciri]
IK_RightMouse=(Action=AttackHeavy)

5. Save the changes. Note that it will merge those new lines into the proper [Combat] heading the next time you start the game.


Usage:
Start the game. When in game, tap right mouse to do a heavy strike. To guard, hold right mouse as usual. To riposte/counter-attack, make sure to HOLD right mouse briefly, as if going into guard, and release when the riposte animation triggers.


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Install v.2 ***ALTERNATE MOD, SPECIAL ON RIGHT MOUSE, GUARD/RIPOSTE ON 'E'***

0. Consider installing the mod "Script Merger", if you haven't already, and install it that way. Mod URL is at the bottom.
1. Extra "modRightMouseHeavy" from the .zip file into the folder [Witcher 3]\mods
2. Navigate to where input.settings is saved, containing your keybinds. It's probably in "My Documents\The Witcher 3" or "C:\Users\[User Name]\Documents\The Witcher 3
4. Make a backup of input.settings
3. open input.settings using notepad
4. From the very top of input.setting, go to Edit and Replace.
5. In "Find what" paste: IK_RightMouse=(Action=LockAndGuard)
6. In "Replace with" paste: IK_RightMouse=(Action=SpecialAttackHeavy,State=Duration,IdleTime=0.2)
7. Now Paste the following into the very top of input.settings:

[Combat]
IK_RightMouse=(Action=AttackHeavy)
IK_E=(Action=LockAndGuard)

[Combat_Replacer_Ciri]
IK_RightMouse=(Action=AttackHeavy)
IK_E=(Action=LockAndGuard)

8. Save the changes. Note that it will merge those new lines into the proper [Combat] heading the next time you start the game.

Usage:
Start the game. When in game, tap right mouse to do a heavy strike. Hold right mouse to charge a heavy special attack. Press and hold 'e' to guard or riposte at the right timing.



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Link to Script Merger (03/12/2015): http://www.nexusmods.com/witcher3/mods/484/?