So Darlyn on GTAForums wanted a mod that would trigger autosave manually, so I made a simple script to do just that.

How to install:
Make sure you have the latest version of GTA V.
Install latest Script Hook V by Alexander Blade (http://www.dev-c.com/gtav/scripthookv/).
Copy the "BetterQuickSave.asi" and "BetterQuickSave.xml" files to your GTA V directory.

How to use:
Press Left-Shift and Plus (+) together to trigger the autosave.

Customizations:
The keys. Use this website to get the hex value for the keys you want to use: http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731(v=vs.85).aspx.

Notes:
The first time you press the button it will ask if you want to overwrite the existing autosave.

Changelog:
v1.1:
Added two keys instead of one, so you can have something like RControl + A as the trigger for the autosave. You can disable the "hold" key by setting it as -1.

Credits:
Darlyn for requesting the script.
LetsPlayOrDy for creating the script.

Please do not redistribute without my permission.