Allow for using "Shift" as the Tiling System activation key

[flyrobot27]

Describe the feature you'd like
I would like to allow for more keybinding option for the "Enable Tiling System" settings.
Currently, only Ctrl, Alt, Super or None are available as the options for enabling the Tiling system (See screenshot). I would like to have the option to use "Shift", or better yet allow for custom keybind, so that it matches the Windows Powershell's Fancy Zone completely.

Additional context

[domferr]

Hey, thank you for this suggestion. The problem I had with SHIFT is that it is already used by GNOME when you grab a window. Look at this video:

Video.del.2025-01-15.18-53-52.webm

In order to test this functionality I need to disable such feature. Do you know if it is possible? Thank you :)