> tl;dr: Does anyone here know how to tell DOS 7 to set the default "insert"
> mode to ON on its commandline ?
Scratch the question. I was looking (searching) at the wrong spot.
Somewhere during my (further) searches I realized that I'm using "doskey"
[1] (to retrieve previously use commandlines), and that one almost
immediatily showed me how to do it. :-)
[1]
https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/doskey
Regards,
Rudy Wieser