I don't know about the old knob and not aware of any UI to do this. But
you can achieve what you want by creating a new Gtk key theme:

As root:
# cd /usr/share/themes
# cp -r Default MyKeys

and put the following in the "MyKeys/gtk-3.0/gtk-keys.css"

    @binding-set mykeys
    {
      bind "<ctrl>w" { "delete-from-cursor" (word-ends, -1) };
    }

    GtkEntry, GtkTextView {
      gtk-key-bindings: mykeys;
    }


Then run as a normal user

$ gsettings set org.gnome.desktop.interface gtk-key-theme MyKeys

This affects all applications using gtk-widgets (Overview is NOT).

Hmmmmm....surely not very end-user friendly...but feature-rich, allowing
for more possibilities...

PS: "gnome-tweak-tool, Typing" has some extra tweaks towards
keyboard/typing, which might be useful.

Olaf Hering writes:

> Many months (or years?) ago someone made GNOME3 usable by providing a
> knob to control the result of ctrl-w. Instead of closing the window it
> wipes the just typed word, as expected. I think it used to be in
> control-center,details. Now with SLE12 I can not find this knob anymore.
>
> What happend to it, how do I get a usable ctrl-w?
>
> Olaf


-- 
Carl Xiong ([email protected])
SUSE Beijing, China
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