Layer Keys across panels

It would be very helpful if TBSB had a feature were special KEY layers could exist that are automatically held across panels, so that duplicates would not increase the file size and also slow down work by excessive copy pasting procedures.

For a very simple example, a background if being a special KEY layer on the first panel would appear on all the successive panels, without actually doing this manually, so an adjustment to that layer would apply to all panels.

If a layer was a character the same would apply, until the layer was made a new KEY and that next adjusted drawing would hold, etc. etc.

I hope this makes sense.
It would save a lot of time and effort.