Could the lack of or incompatible MMU be responsible for 9.2.2 not running on Pre-G3 PowerMacs too? I would think that there was a fair bit of effort to get 9.2.2 running on, say, a 6100 sometime in the past. The 9.2.2 Finder works fine with a 9.1 system on these Macs so it should be constrained directly to the System file.

It would be AWESOME if the ease at which we're beginning to hobby-hack early 1990s Macs will apply to late 1990s Macs in the future. dougg3 is paving the way with his Power Mac G3 firmware update I think!