It is not pretty but you can add a sym link from somewhere inside you /home/zaurus/Documents directory to your smb mount point.
i.e.
ln -s /mnt/smb/ /home/zaurus/Documents/smb
Now you should be able to see your smb stuff under the Internal Flash Icon in the Files tab.
A word of warning there are a couple of problem with this.
1) If you open an application like image viewer or musicplayer, they search your whole file tab for files, including your new smb link. If you have a large smb share this can take ages.
2) I have seen this seriously break the sharp back-up tools if you don?t unmount the share before back-up. This is because the back-up sometimes follows all sym links and stores copies of the files not the sym links themselves. I did this once and did not notice until I tried to restore a 256MB back-up image on the 32MB memory of my sl-5500, fun