I.e. you don’t change anything in the insert dialog.
Well, you should instead
More Fields. It will open on the last used tab. In case this was
Variables. Click on name and OK.
If you find there are too many steps and you have to leave keyboard for mouse, assign a shortcut to the menu item in
Customize; the rest can be done with keyboard.
If your preferred workflow is copy/paste, copy from a non-initial occurrence.
Yet another approach is to define an AutoText entry containing an ad hoc number range field. After that, you type the AutoText “id” + F3. This may be the shortest and cleanest way.
I don’t think this is a good idea. It would impact a lot of things in Writer for a “niche” usage. IMHO setting a starting value should remain a direct formatting action, just like other formatting “accidents” (formatting directives for “exceptional” circumstances, occurring very rarely in a document).
Basically a number range is a variable with an implicitly incrementing value. A number range itself has additional properties/attributes like numbering by chapter.
The underlying device is also used in list styles with yet other extra properties, but you’re right, provision has been made for user to provide an initial value.