Source (link to git-repo or to original if based on someone elses unmodified work): https://github.com/wsdfhjxc/plasma-desktop-run-command
This is a simple plugin for KDE Plasma which allows running a custom command, by invoking a specified mouse action on the desktop area. To give you an example, such feature may be useful if you want to run third-party application launchers, or to quickly spawn Konsole with a single click, or to launch a custom script, etc.
ATTENTION! This is important:
For more details and installation instructions, please see the GitHub repository.