I think it would be great to have simple wiki syntax markup in the notes that go with each task (not sure what they're called). Bullet lists starting with " * ", strikeout with ~~text~~, bold/italic with *text* and _text_ and so on. There are lots of free wiki syntax processors out there you could use.
Agreed. I like the file upload feature, but it would be really helpful to mark up the content in the note even just a little bit to separate ideas or make sections. I will often put log entries in a task note so I can see the history of its progress. A little markup would help separate those log entries into a separate section.