How to save the default mode of a custom workspace? When designing new workspaces, there doesn't seem to be a way to save or define the default mode of that workspace.  You can duplicate one of the presets and go from there, which would work fine... but there isn't a preset for painting Vertices, even though this is one of the selectable modes. 

Currently it would seem to be impossible to create a vertex painting workspace.

Is there a way to do this?
Either from the 3D View Sidebar > Tools tab or from the Properties Window > Active Tool tab there is a workspace panel.

The dropdown menu allows you to define a default workspace mode. After that save the startup file from the File > Defaults > Save Startup File menu entry so it is available next time you start a new session.