Hoping for comma separated or password shifting
Instead of simple shifts like 1 or 2 for each letter, it would be nice be able to do comma separated shifts like 1,2 (or 9,1,6,5 for example — every 1st letter shifts 9, every second shifts 1, third shifts 6, etc). Password shifting would operate similarly behind the scenes. Encode your message with a simple word, let’s use “lime” as the example: behind the scenes the app encodes with “12,9,13,5” (m being 13th letter of alphabet).