According to the Video editing applications handbook https://kdenlive.org/video-editing-applications-handbook/ Kdenlive has a feature - Lines reproduced below:

Play: L (for multispeed press more times L, for 50% slow motion press Shift+L)
Play backward: J (for multispeed press more times J, for 50% slow motion press Shift+J)

In version 17.12 Shift + L locks a track. Was this a feature in older versions of Kdenlive which has been removed?

I would find it useful. Is there any way to get it back (undocumented feature) or is there a good reason for it being dropped?

-=Ken=-

That page you mentioned describes a wish list. Slow playing forward/backward is not implemented for now (17.12.3).

Ah, yes. Reading closer, I find that it does include some desired items. Thanks for pointing that out.

-=Ken=-