Thanks for the effort Michael, but I was aware of that.
For my watches work I like to have a style locked colored in orange (I have a dark grid setup) that contain all the construction line, because I use them many times and sometimes for booleans.
Constructions lines are very cool for their purpose, but even with them I still miss a line from center point :)
Because a line from center point can be used for other things that just making construction lines.

Anyway thanks for all the time you take to write clear answers, have a good weekend.