Curious if you ever got the rom folders to merge?
Thanks
I don't know if you should expect an answer from cose to 10 years ago from that user, but there's a way to do it, I found how for WiiSX's several forks and can fortunately be replicated here.
Get a Hex Editor, open both versions of Wii64 (Glide and Rice) and do a text search for the word roms.
The second and third results should be directory paths:
usb:/wii64/roms
sd:/wii64/roms
Just change "wii" to "not" (so it becomes "usb:/not64/roms" for example), save and you're done, Wii64 Glide and Wii64 Rice, the current versions of Wii64, will look in the same folder as Not64.
Not64 seems to be compiled differently, and you cannot find the paths in this simple way, if they were easily edited you could use any folder you'd like to, but this already acomplishes what you wanted.