Good News!
The issue with this mod causing Skyrim to process off-screen keyboard keys have been resolved!
A very big thanks to LePhilanthrope for finding the issue (my patch was incorrect)!

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REQUIRES THE LATEST VERSION OF MY DLL LOADER TO BE INSTALLED -IF- YOU ARE NOT USING SKSE64!
LINK HERE (DLL LOADER)
LINK HERE (SKSE64)
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What is this?
It's a plugin I made that enables keyboard shortcuts by patching SkyrimSE.exe during runtime. It's designed to be version independent.
Alt-F4, volume keys - it just works!

How to install

• If upgrading (prior to 1.0.0.3), please uninstall the mod first as the file structure has changed.
• Install my Dll Loader manually -OR- SKSE64.
• Install this mod via your mod manager.
• Refer to these images (1, 2) to make sure it's installed correctly.
• Play!
  

How to uninstall

• Uninstall via your mod manager.
  

How to install (MANUALLY)

• If upgrading (prior to 1.0.0.3), please uninstall the mod first as the file structure has changed.
• Install my Dll Loader manually -OR- SKSE64.
• Copy the Plugins & SKSE folder to Skyrim SE's Data folder (SKSE folder is only required if you are not using my dll loader).
• Refer to these images (1, 2) to make sure it's installed correctly.
• Play!
  

How to uninstall (MANUALLY)

• Delete:
  Data\Plugins\KeyboardShortcutsFix.dll
  Data\Plugins\KeyboardShortcutsFix.ini
  Data\Plugins\KeyboardShortcutsFix.dll_Exports.txt
  Data\Plugins\KeyboardShortcutsFix.log (if present)
  Data\SKSE\Plugins\KeyboardShortcutsFixLoader.dll

Options:
KeyboardShortcutsFix.ini located in Data\Plugins\Sumwunn contains these options:

bEnableLogging=1
; 0 = Disabled
; 1 = Enabled
bIgnoreExpectedProcessName=0
; 0 = Expected process name detection enabled
; 1 = Ignore SkyrimSE.exe name detection. Allows mod to work regardless of EXE name

How do I know if it's working?
Try some keyboard shortcuts! Alternatively, you can check the log file.

After you've started Skyrim SE (you can alt-tab for this part), go to Data\Plugins\Sumwunn, there's a log file called: KeyboardShortcutsFix.log. 

It will either say "YES" or "NO". Indicating whether or not the plugin successfully patched Skyrim SE. So if it says NO, lemme know!

Will it need updating?
Probably not! I've designed this to be version independent; however, in the case that it does, I will try to fix it quickly. Below is a list of game versions that have been tested and working.

Tested & working versions w/ 1.0.0.3+:
1.6.640.0
1.5.97.0
1.5.3.0.8
1.4.2.0.8
1.3.9.0.8
1.3.5.0.8
1.2.39.0.8
1.2.36.0.8
1.1.51.0.8
1.1.47.0.8

Source Code

NOTES

• This will not get you VAC banned in any manner as Skyrim SE does not use any anti-cheat.
• If the mod is not working, try restarting Steam and/or your computer.
  

• Written in C++/ASM.
  

CREDITS:
LePhilanthrope for solving the keyboard keys being processed off-screen issue
Bethesda for Skyrim SE (http://store.steampowered.com/app/489830/)
Microsoft for Visual Studio (https://www.visualstudio.com/)
The UASM devs (https://github.com/Terraspace/UASM)