> 1) Reboot code doesn't work. Whether I halt and then reboot,
> or just give it C-A-A, the machine just hangs at a gray screen.
> It doesn't even make it to the AmigaDOS boot menu.

 Do you have Kick-ROMs? How do you start NetBSD exactly?

> 2) Can't add new users. If I run vipw and add the line
> 
> george::101:200::0:0:George:/home/george:/bin/csh

 Looks perfect; did work for me. Try to generate a new, fresh database:
"man pwd_mkdb"


-- 
Markus Illenseer