To quickly summarize from 0001798 what the challenges are: For this to be useful, this can't just be about the pattern editor column itself (hence I changed the title). This feature would have to change the instrument number representation everywhere in the program: Tree view, instrument editor, note properties dialog, find / replace, comments tab. And since the instrument column may also contain plugin indices (for PC events), this would probably also imply that plugin indices need to be hex as well, which would add even more places to this list.