KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
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Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
KDE 6 seems to have gotten rid of run command, mark taskbar entry and log to a file options in applications specific settings under notification settings, only play a sound and show message in popup actions remain.
Are there any plans to bring back this functionality in future updates?
The screen turning off when it automatically locks is an added bonus; the priority is to be able to command the system to simultaneously lock and turn off the screen. You're correct that the setting at zero seconds safely achieves that.
I've had other, more stupid uses for running commands, though I don't think any are actively in use.
Taking actions on network reconfiguration, charge completion, and SMART failure are all things that spring to mind. It's nice to be able to set those kinds of things in a GUI rather than putting them in /etc/something.d