It's a patch that is ill-advised for multitiasking on Amiga since it allows lower-priority tasks to be promoted to higher priority. That, in turn, allows things that should never be overruled by a lower-priority task to be overruled, etc. Calling it a trojan may be an exaggeration but either way, you should never run it.
No separation of kernel and userspace, then? Is this just a priority scheduler with a basic "aging" mechanism?