Option to show titlebar-spacer when using "Optimise browser for Vertical Tab Bar"

[Ryonez]

When a user has selected the option Optimise browser for Vertical Tab Bar under Settings -> Design -> Tab Bar, this just leaves the toolbar at top.

So, with the Default option you see...

And if you select Optimise browser for Vertical Tab Bar

*Please ignore the white vertical line, I added that while testing things.

When the titlebar is enabled, an element called titlebar-spacer is there. My problem is when the titlebar is disabled, there is no such element for the toolbar, leaving no space to drag around the window, or double click to minimise/maximise.
There is a workaround of sort, which is to customise the toolbar and add a Flexable Space, which does allow dragging the windows around and resizing. However this is quite large and doesn't really look good.

titlebar-spacer:

Flexable Space:

My request is for an additional option to be added with Optimise browser for Vertical Tab Bar, maybe called Enable the titlebar-spacer on the Toolbar, which adds/moves the titlebar-spacer there (and adjust the height to match the toolbar).