Somehow the same wishes always circle back:

“Aww, wouldn't it be cool if <insert random unfinished project name> had a built-in editor and I could code the app on my {phone, PDA} whilst I'm using it?”

A few decades ago that's how the Hint project started, which quickly got nowhere -- mostly because I was trying to get everywhere at the same time.

And of course later I realized the goal is its own anti-goal -- it's already hard to finish one project, so adding another project inside that project pretty much guarantees that neither gets anywhere, fast.