Hello Michael ! Thank you for the follow up-as always. I'll try to clarify.

- Indeed that's what I mean by "world location" : the location of the bounding box of the currently selected object (or objects). That way the plane would appear right where it is needed for drafting, as screen space sketching very often relates to an existing element of a design (like for instance drafting the outline of a headlight at the location where it will be ultimately be, near the front of the body of a car.)

- As for the fallback if no object is selected : that would be the behavior of the script from just earlier, which is to have the custom, view-aligned Cplane by place at the world origin. But maybe that's self-evident and/or already built into the command.

Btw, is there an api/command reference page out there for all the tools ? Like for instance how to add options in scripts/shortcuts for things like "apply to all views", and so on.
[edit] Probably this ? http://kyticka.webzdarma.cz/3d/moi/