It is really annoing to change mmu always if you want use 68k warp3 software or ppc warp3d software. Also, it can be ppc software with 68k mmu settings

like descent demo ..
So, only one solution it is change by hands MMU settings and reboot. But, it possible to write little patch, which can be reload pci.library ..
here is my question to mediato group:
"> Well..It is possible to change ENV:Mediator/MMU config
> in realtime, without reboot ? So be it will a 'hack' but,
> it possible somehow ?
The only way you would be able to do it is if you could expunge pci.library from the libraries list, as I would guess that this would be a once-only read when pci.library is opened.After that, just re-start something that opens it. This would involve clearing every other process that has it open - eg. voodoo.card, spider.device, ahi drivers, everything.
You can find out how many processes are using the library from Scout, and even try to get it to expunge - the Remove button in Scout.
The only real way for something like this to be done properly would be a new Refresh function added to pci.library, and a suitable shell command that will call it."