Add keyd keyboard remapping for sysrq shortcut on Mac mode keyboards

[acrogenesis]

This PR adds support for the keyd keyboard remapping daemon to fix print screen functionality on Mac mode keyboards by mapping leftmeta+leftshift+4 to the sysrq key.
You can still use left super + left shift + 4 to move a window to the 4th workspace.

Changes Made

New Files:

• keyd.sh - Hardware configuration script that:

  • Installs the keyd package from AUR
  • Creates /etc/keyd/default.conf with keyboard mappings
  • Enables and starts the keyd service

• 1756583646.sh - Migration script that sources the hardware config for automatic setup

Why This Change?

• Mac Mode Keyboards: Many Mac-style keyboards like my Keychron K3 send leftmeta+leftshift+4 at the firmware level to simulate a print screen for mac instead of the button being mapped to a true print screen.
• Universal Compatibility: Uses default.conf without device-specific IDs, so it works with any keyboard.

[Copilot]

Pull Request Overview

This PR adds support for the keyd keyboard remapping daemon to fix print screen functionality on Mac-style keyboards (like the Keychron K3) by mapping the Mac-specific leftmeta+leftshift+4 key combination to the sysrq key.

• Introduces a hardware configuration script to install and configure keyd
• Adds a migration script for automatic setup during system migrations
• Uses a universal configuration that works with any keyboard without device-specific IDs

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
migrations/1756583646.sh	Migration script that sources the keyd hardware configuration for automatic setup
install/config/hardware/keyd.sh	Hardware configuration script that installs keyd, creates configuration file, and enables the service

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[doctorguile]

keyd is powerful but to achieve what you want i think its more straight forward to just add this to

~/.config/hypr/bindings.conf

bindd = SUPER ALT SHIFT, 4, Screenshot of region, exec, omarchy-cmd-screenshot

Although I appreciate your post as I was trying to find a way to enable sticky shift key

keyd + the following config did the trick for me

shift = oneshot(shift)

[acrogenesis]

Hi @doctorguile, I recently changed keyboards to the flow84 and tried your proposed method and it doesn't work.
I believe it has something to do with how the keyboards send the keypress automatically.

In the new commit 75cdeff I added leftmeta+leftshift+3 = sysrq which covers this keyboard "mac" print screen