Updated first post.
the most recent nightly builds support USB2 mass storage devices now. USB2 requires HBC v1.0.8, and HBC itself must use IOS58.
See hackmii.com
Excellent, indeed. After updating my HBC and such to get IOS58 support, I found this forum that explained why my ScummVM install stopped being able to read my hard drive. Updated it to a nightly build and voila! 7th Guest on my TV again!
I cannot get the DVD of games I just burned to work with the latest nightly build of ScummVM-Wii. When I click on "Add game," it only lets me select directories on the SD card. Do the nightly builds have DVD support or am I going to have to compile my own build?
EDIT: Nevermind, I got it working. I didn't realize you had to press "1" and then mount the DVD. Maybe this info could go into the "Readmii" file?