I'll be looking forward to your visualizations I think this is a fun piece of 'JJ paleontology'

I'll look into EMSK to see if I can figure it out.


EDIT: Something just popped into my mind. JCS also saves which layer you're looking at. In the J2L format specification in the ERE, I can't find where this is stored (though there are JCS Focus positions). I think this is known but just not documented, just like the layer properties flag bits? Anyway, I suspect the 'char Unknown' I found missing in UR's EDIT block is actually the layer number that MLLE was focussed on upon saving, 0-based. It's 3 in many levels (which means they were editing the Sprite Layer). This is just a random thought though, I don't have any proof. Also, if this is correct, we should probably also find some MLLE Focus positions somewhere.