The DiiMO CP is a bit weird. The state of its two preferences are stored as a resource in the CP itself. It's got two paths for enable/disable cache - both via an INIT and also at runtime, immediately when you check or uncheck the cache checkbox. SANE patches are only applied at boot time.
The CP has no other function, no patches to mitigate functional issues like other some other accels require. Since the Diimo is functionally transparent, FreeBSD and A/UX are fine with it as it just acts like a roided out 68030.