Not so sure if you open a 10mb gcode file in webinterface. Maybe when it is done layerwise also you get much overhead since we need to rewrite and reparse and render whole file after storing.
While this works you might notice that layer preview shows wrong gcode as soon as you change the length of a line as this does not match precomputed positions any more. I think I leave this for later as a possibility for such cases. Makes in deed most sense for layer 0/1.
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I didn't think of that.
Sometimes I need to change a temperature setting or some other thing in the beginning.
Till now I just have logged in via Putty to the console, and edited it from there.