[BUGGLET] User mounting of CD-ROM/RW's work fine, but ZIP's have issues

[John Merryweather Cooper]

Recently, I turned on User mounting in accordance with the GNOME FAQ. 
I'm operating on a recent -CURRENT.

First, CD-ROM's and CDRW's work perfectly--mounting, reading, writing,
and ejecting (unmounting).  But . . . .

ATAPI ZIP's don't work so well.  They do mount, read, and write, but
unmounting/ejecting is a strictly manual (command line) operation. 
Moreover, if you close the ZIP drive window and then try to re-open it,
GNOME refuses saying that the drive is busy.  It appears this occurs
because GNOME is trying to re-mount and already mounted system.  But
there is no "Eject" option like the CD-ROM's and no unmount choice
either.

My /etc/fstab line looks like:

/dev/afd0s4  /home/johnmary/zip  msdosfs  rw,noauto  0  0

Is this a known issue?  Can it be fixed?