I’m for keeping it sorted by topic. For example I/O, U/D should definitely be stacked together. You’re not really using this list to see what letter is which effect, but the other way around.
Totally!!! Alphabetic is nonsense in this case. The only tweak I would suggest is having the tips not sit on a text row like that but more aligned, like a table.
mockup:
2666
(it would also help if the codes could be in the pattern editors font or another monospace font.)