Hmm. Open-sourcing MASCOT just might be possible - if I got it right, neither Mr. Spees or Ambrosia are going to update it or support it, so they just might let someone else do it.
As for aschaaf's picture, I suppose that the point was not the goblin (which in my opinion wouldn't be very fitting as a treasure chest) but some userfriendly additions, such as the ability to choose the item required for opening and the item inside from a list, rather than having to type in some obscure ID numbers. And personally, I do think that they would make editing easier.
Of course, Mr. Spees owns the code, and especially since he apparently likes reusing code (MASCOT Editor is based on Harry the Handsome Executive's editor, right?), he might want to keep it to himself for future use. Besides, since MASCOT is somewhat rough and otherwise unfinished, MASCOT might not be exactly the greatest piece of coding he has done in his life. I suppose that it might not only be difficult to edit, but that it would also rather embarassing for a great programmer if people started writing posts like "Uh... jes' what the heck is up with this so-called piece of code? I can't make it out! This has to be the most radically confusing and obfuscated program I've ever seen in my whole life!" to the Ferazel Hacking web board.
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"I don't say yes or no, more like the other way around"
Ankh Starrunner, The Diamond Blaster