For this reason I proposed the alternative, much more logical and intuitive, of using a mark ... such as entry and exit points.

You could even create new start and end render labels, and with these labels define as many sections as we want, named labels, Start Render, Finish Render. Marks for rendering, both batch and normal, to be able to create non-contiguous sections within the same project

A system that improves the current one and that does not leave any old project unprotected. And much more in line with applications of this type.