save default startup file 'UI only'

Often I create a new workspace during working on a file, and would like to have that workspace always available in new files. I can't use save default startup file, because that also adds the scene geometry and what not to the default startup blend file.

I think a 'UI only' option should be added to the save startup file operator, so that nothing but the UI gets changed in the existing startup file.

Perhaps better still, there could be a list of options of what you want writing to the startup file, in the form of the following checkboxes:

UI Only

Objects

Geometry

Particles

Materials

Scripts

Actions

Node Trees

Scenes

ETC

With the option to:

REPLACE ALL - selected elements of current blend file completely replaces old startup file elementes of the same type, existing elements are initially removed from the startup file.

ADD - add elements from this file to the startup file, only if they're not present in the startup file already OR if they are present in the startup file, but are different in the current file.