I've used a couple composing programs that have had a toggle to only let you key in notes that are within the musical scale you select. For instance, if you have the toggle enabled to CM, you could only key in CDEFGABC and all intermediate notes would do nothing. It's a helpful tool for composing melody and for people like myself who aren't great with theory and I think melds great with the pico8 design schema.

Would it be possible to get such a feature?

Thanks!