Another thing I've been thinking about in the past is how do you preserve formatting when translating between visual/textual. Eg, if I place a visual node and then edit the text, does it preserve my visual layout? This is important because I've used Max/MSP in the past and I would logically lay out the code by function to make it easier to comprehend. Similarly, preserving whitespace in the textual form even when editing the visual form.

I don't know if or how luna handles this, but its a concern that I've had trouble with when I was thinking about something similar in the past.