It looks like you're new here. If you want to get involved, click one of these buttons!
One thing I would love to see in Codea is support for the MoonScript language.
I haven't yet used MoonScript for Lua coding, but it's very, very close in syntax and spirit to CoffeeScript, which is now turning into one of my favorite languages.
I think concise & readable, in the small amount of space available to write code in Codea, would be a huge win. I suspect changing the editor to make leading whitespace on source lines more visible would not be a huge change.