TIG, thank you for taking the time to produce such an expansive reply, it's thoroughly appreciated. I do completely see the disadvantages to producing geometry with individual layers, it seems a good precise habit in CAD, isn't so helpful in SU! So far using the (wrong) technique I've been using, it hasn't caused any problems, but I completely appreciate it could create insanity. Herein I'll use Layer0 for geometry and layer names for components/groups and see how I get on - thank you again for clarifying this, really very much appreciated.
Going back to my original question, I guess the request for this feature is mute by using the Layer0 technique - so that, answers that!
Thank you again for your help.
All the very best,
Chris