The source for the latest AsmPro (1.17) doesn't seem to be available, though if one somehow managed to contact Flasher Jack he would probably happily supply it. I would be happy to have a look at it again, but it sure isn't easy navigating 900kb of mostly uncommented (resourced) asm...
It actually is available and not even hard to find, that is, if you know where to look. :D It's available on Hitchhikr's (aka Flasher Jack) website and can be found here:
AsmPro Source. :) Now you can have some "fun" again Blueberry. :D