Yes, thats because if a G-Rex is present, if the install disk tries to initialise a CVPPC, it crashes. Without G-Rex documentation they couldn't fix this.
In most cases, the OS4 install automatically shows up on any connected OS4 compatible gfx card screen.
I'm pretty sure Hyperion would consider any usage of OS4 on an emulator to be against the EULA. Whether or not that stops you is up to you i guess.
I'm also pretty sure the hardware situation will be sorted out.
