option to add octave line while still retaining existing note registers and accompanying tab

Hi. As I often need to leverage octave lines (8va, 8vb) when creating scores and recently started working on some guitar transcriptions that have accompanying tabs as well--where this becomes more critical--I'd like to request an option that allows you select one or more existing notes, measures, or continuous string of notes/chords and invokes a process that both transcribes the corresponding written stave(s) but keeps the notes in the exact pitch they were, along with any TAB.

To clarify, my experience seems to dictate that making a choice to adapt parts of score that's already written in the correct register to add an octave line (strictly for easier reading) requires both moving the selection up or down the corresponding octave and adding the opposing 8va or 8vb line to normalize the pitches again. It would really be nice to be able to make the transition happen in one fell swoop (i.e. clicking on one action that takes care of transposing the score by an octave an adding the opposing octave line)--and, when TAB comes into play, it would also be great to freeze the TAB so that it doesn't change during this entire operation. Even with the TAB element removed, just having the ability to rewrite a selection 8va, 8vb, 15va, or 15va and retain the existing note registers would be helpful (though ensuring the TAB isn't manipulated would be a big plus).

Thanks very much and best wishes,

Alan