I prefer Nashville numbers for most songs, but for a few song my brain is too slow and needs the letters spelled out. Though I can change the global ‘Show chords as…’ setting when going to/from such a song, it would be more convenient (faster in a jam) if I could just override the display for specific songs so they locally latch to whatever type of display I always want for that song.
Or if I can download a faster brain, that’s a fine option too. 
I’ve thought about adding a way to set per-song preferences for chord display (and other options like count-in) because I will hear requests for it from time to time. But I’ve done surveys on the matter and the vast majority of users had no interest in it, and I can’t figure out a way to add it without complicating the interface in a way that would make it less elegant and more confusing, so I’ve decided against it.
That said, I hear you about those complex songs, and I wonder if another solution for your problem would be to add a way to show a quick numbers-to-letters “cheat sheet” below the song? For example,
1 = A 3b = C 4 = D 5 = E etc
…or perhaps…
1♯⁶ = A⁶ 1♯º⁷ = Aº⁷ 2m⁷ = Bm⁷ etc
Haven’t thought too deeply about this sort of feature but it’s been suggested before and I think it may have merit as a learning tool if done right…
Then again, this might be just as slow or slower than you just figuring it out in your brain!
Customizable keyboard shortcuts are coming, and I expect to add this as an option that you can bind to a key. That won’t help you on a phone or tablet (“in a jam”) unless you connect a Bluetooth keyboard, but I also want to explore adding customizable gesture support which you could in theory bind to the same function.
Thanks for putting the thought into it and the response! No problem if this is a unique use case; I can understand your decision. In the meantime, my workaround is just to put the actual chords in the Notepad, e.g. like this for Ashokan Farewell. (Yes, the cheat sheet conversions would also work, but still a lot of stress for my brain LOL.)
In D open:
| D D7 | G Em | D Bm | G A |
| Bm D | G Em | D Bm | A D |
| D D7 | G D | Bm Em | A7sus4 A7 |
| D C | G D | D D | A D |
Ah, that’s a good workaround!
Notepad tip: you can put triple backticks (```) before and after a section to have it render as monospace.
Someday if we have the ability to attach images to your notes then this will be as easy as taking a screenshot and dragging it into the Notepad. 
you can put triple backticks (```) before and after a section to have it render as monospace.
Nice! Now looks like:
… the ability to attach images to your notes…
This could also be a useful way to effectively created ‘zoomed’ lyrics for improved legibility.
Thanks!
I’m confident that even before image attachments arrive we’ll have a font-size adjustment for the Notepad. If that doesn’t happen this year I will eat my hat.
