Sometimes I mess up, and fixing it is beyond obnoxious. It really is quite a pain to have to create a new note, select the template, make the changes, save as a new template (with a new modified name because you can't have two files with the same name) save as a new template. I love using templates, and most of my notes are structured within a core set of them. It's such a great feature, but not being able to edit the templates outside of this process is hard to understand.
Encrypting text within notes is great, but I know I would really enjoy being able to encrypt batches of notes at the notebook level. Navigating between several encrypted notes can be clunky, and a notebook master password that unlocks 'x' number of notes within the notebook would simplify the process greatly.