I would rather kudos that than make LCL visible in all plots and guide into using it in wrong way.
I'm fairly sure I have seen wish list item in community requesting that we could have multiple limits (I tried to find it but couldn't quickly). In best case I think we should be able to choose the value we see, name which we see, line colors and line styles (fairly easy to build addin for this)
Edit:
I think this is the one I did rememberSecondary Working Limits Set . A bit different than I did remember, so maybe new wish list item is a good idea. I still think it would be better if we could have some "Show Lines" type of column property than showing control limits in distribution plots.
-Jarmo