In 16, this feature request was implemented and I thank you every day for that. A big time saver! Script Workspace: open subscript in new tab [DELIVERED]
But there‘s still something in the way. Very often, the starting point in the script edition is the button object on the layout. And if you open a script from there it opens in the simplified script window, not the main script workspace, and for some reason (probably a good one even if I don’t see it), you can’t open a subscript from there.
What I think is missing is either the possibility to open a script in the workspace directly from the layout button object (and script triggers...) or a more generic way to open it in the workspace from the simplified script window.