lock a section when comping tracks

If there is a way to do this, please ignore, or better yet, tell me how.

When comping a track, I would like to be able to temporarily lock a section that I have chosen as I work through a piece. I don’t know how many times I have accidentally/unknowingly, clicked on lane and selected a different choice and not noticed until later. If it is decided later that the section should be changed, unlock it and choose the desired section and re-lock it again.

Anybody agree that this would be a useful feature?