I guess this is a low use case, but I thought no harm making a suggestion.....
I play with a group of friends in a Spanish Folk Group here in Spain. They always use Do Re Mi etc...
I resisted for a while and did my own sheets ( and when the leader ask us to play "Si" I still play C instead of B :-). My brain is to slow.
My head needs to be in the same place as everyone else so I know use Do Re Mi with the group.
I create the chord sheets as a PDF using DO RE MI for everyone which is time consuming, and use the app ForScore as my display (I like it's full screen option and I only need lyric only displays). I could use the PDF's in stageTrax, but prefer chord lyrics as they are easier to read and I can transcribe on the fly if necessary.
What am I Asking for ?
A toggle against a song that would display the C D E F chords as DO RE MI FA instead. Ideally this would also apply to EXPORT of Lyrics as Rendered PDF. No problem using C D E F to enter the lyrics , just be great to read DO RE MI FA on the screen for some songs, but stick with C D E F on others.