Option to stop playback when the lock screen is active

[terr72]

Currently playback continues when the physical on/off button is pressed and the lock screen appears.
It would be nice to have this configurable, so that you can choose if the playback stops or continues when doing so.

Background:
Not only elder people struggle to stop the playback, especially when it needs to be closed quick (for example when the door bell rings). Right now you need to tap the screen and hit the small x-button in the top left (which is also a bit unusual).
It would be more intuitive and quicker that the playback stops when the physical on/off-button is pressed and the lock screen appears.

[terr72]

I'd like to add that what I'm requesting as option is actually the default behaviour of the mediathek apps by Arte et al.