We've been working with Marty Zigman who's creating a Bitcoin plugin for
NetSuite accounting platform, and he was already forced to switch
micro-BTC long ago for exactly the reasons described above.  I think the
system will track up to 3 decimal places without causing all sorts of
heartache and automatic rounding.

Of course, as Mike said, this ship may have already sailed, but if
there's any way to revisit this, I'm there.  We're just about to do
another Armory release and could support this very easily.