If I read everything right, the KickTOS disk loads a copy of TOS (Atari ST's based OS) into the area where Kickstart normally goes. Then the Atari emulator points to TOS so you can run Atari ST stuff.
A long time ago I did work on Medusa (an Atari emulator) and had to do a bunch of TOS work. It was a neat project but I was also just a kid...
Still, this is pretty cool! :-)
It was my understanding that KickTOS wasn't an emulator, that it was a hacked TOS that ran native on the Amiga... essentially turning your A1000 into an Atari ST, but with a bunch of dormant amiga hardware. It loads TOS into the WCS, then just runs natively from there as if it were an ST. Or am I mistaken?