> Could NetBSD do better? (Not only for scsi buses necessarily but on any
> bus that could potentially have devices that are not switched on at
> boot time)

This is also an issue for things like PCMCIA devices...or removable 
hardrives, or hot swap hardware (don't laugh, I know of people running
BSDI on Centrum boxes as term servers and routers).
 
> I realise that the dynamic mapping of scsi targets to devices (st*
> at scsibus? target ? lun ? ) could not work, but a fixed mapping could.
> (Or am I being silly and it works already - I cannot try this myself).

I would be very nice if there were some sort of general support for 
post boot configuration of a device.  Things like the PCMCIA ethernet
drivers have to fudge.

General support for plugging in anything doesn't have to be
offered, but it would be nice to be able to initiate reconfig of
a device after boot.  Either to add it or remove it - or reconfigure it. 
--
Mark