Correct.
Yes, it should do that now.
Yes, it should before 3.0 final, but it doesn’t currently.
Yes, it will at minimal support FoldingText style scripting. That is a small apple events interface through which you can pass JavaScript that will be executed against TaskPaper’s internal scripting model (like FoldingText, TaskPaper is mostly a JavaScript application).
I also have the goal of creating a backward compatibility TaskPaper 2 scripting interface. But I started that last week and gave up because implementing AppleScript support is a big pain and nothing ever works as I expect. I imagine I’ll try again later I guess.