Very Computer

I just got a MacAlly 2 button ADB mouse. The left button works, and
the right one doesn't do squat. I've read all over the place that I'm
supposed to do mousemode 3 66 to make all my problems disappear. But
this command doesn't work: the mouse rejects the handler change. I've
tried it using Apple's ADB Parser utility, too: set register 3 of
device 3 to 0x2342. Then ask it to spew back register 3, and, lo and
behold, it's still using whatever handler it was before. I seemingly
can assign it handlers 1, 2, or 4, but none of these let me use the
right button. Any ideas?
-Nathan