DreymaR's extension layers to COLEMAK provide a setup that these as well as backspace/delete: https://forum.colemak.com/topic/1438-dreymars-big-bag-of-key...

I've been using my own XKB keymap and hotkeys based on Ergoemacs that lets me use some other Emacs-style shortcuts like "kill-word" everywhere as well. It's great to be able to have at least somewhat efficient text editing no matter the program.

Tl-Dr;

Relative newcomer to the world of computers independently re-invents keyboard mappings that allow similar control as is provided by the 38 year old WordStar control key combinations for text editing purposes.

What was old is new again....