Hello,

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Updated to v1.1 due to a bug
Updated to v2.0 (06-11-2015):

• Added the ingame menu. Therefore this version is requires the Custom Localization Fix mod by uacvax. Installation changed!
  

Updated to v2.1 (08-11-2015)

• Added the option of the enemy kill XP reward modification based on difficulty (unique slider for all difficulties)
  

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Installation:
0. Install the Custom Localization Fix mod by uacvax.
1. Use NMM for the main file. Install/Enable the mod with NMM
2. Download the optional file (modEXPCustomizer_menu) and unpack it to your Witcher 3 install folder. The modEXPCustomizer_menu.xml file should be in the <Your Witcher install dir>\bin\config\r4game\user_config_matrix\pc folder
3. After installation of the mod you have to setup the variables in the ingame menu (menu screen/mods/Customizable...).
For every customizable option there is a Preset named Original settings. Press it and you will get the Vanilla settings
If somebody knows how to edit/set the ingame menu default values please inform me for update the mod.

This mod allows you to modify the Vanilla XP modifier calculation for Quest rewards and from v2.1 you can alter enemy kills too.
(I know there is a lot of mods like this, but there is some more later :) )

You can modify variables for the Vanilla value of:

• Grey Quest modifier
• Level diff limit for grey quests
• Finished main game exp modifier
• Exp modifier if the calculated modifier is 0
• Exp modifier for Easy/Normal difficulty
• Exp modifier for Hard difficulty
• Exp modifier for Hardcore difficulty
• Level difference based Exp modifier for EP1
• Experience modifier maximum for EP1
  

So you can modify all the possible values of the XP modifier calculation for the vanilla system.

You can also enable or disable the XP reward modification for Enemy kills

• Unique slider for all difficulties
  

This mod is add a new XP modifier calculation system for the game, called Bonus/Malus system.
You can set a customizable threshold around the quest level:

• If Geralt's level is in the threshold: he gets the normal EXP for the quest
• If quest level is above Geralt+Threshold: Geralt will receive addition to exp modifier for every level (the percentage of the addition is customizable also the maximum of the modifier)
• If quest level is below Geralt-Threshold: Geralt will receive a reduction to exp modifier for every level (the percentage of the reduction is customizable also the minimum of the modifier)
  

All the above calculation is also affected by the difficulty modifier and the finished game modifier

Compatibility:
The mod is based on the v1.11 version of the below scripts:

• r4Game.ws
• npc.ws
  

If you are using mods that alters those files you have to merge them: look for Script Merger by AnotherSymbiote on Nexus.

Thanks to:
CDPR for the great game
Michel7890 for the NoGreyQuest (which is currently abandoned. The customizable Vanilla calculation idea was based on that mod)
svaalbard for the WitcherScript Notepad++ Styles 
Aurielius for volunteering for testing
JensD for asking more info about customization (so sort-of a readme in the discussion and in the forums created)
uacvax for the Custom Localization Fix mod
biboncodon for asking about monster kills :)