I may have found (bought) a great solution to the SMB mounting problem. Dave 4.02 for OSX.

I just had a network connection go down, and I was expecting the usual long dismount disco, and lo and behold, Dave pops up with "A network share forceably went down" or some thing like that, but forceably was used. Then it said I should remove the volume from my desktop. Well, it wasn't there because I have so many volumes mounted at the same time that it would clutter the place up. So I went to finder and clicked on the shared volume that was still in the list, and hit eject and pop, it was gone.

If you ask me, DAVE is worth every penny for all the things it's solved for me in the past week! I'm sold! (I do NOT work for Thursby or have any connection other than being very happy to have bought 20 licenses.)

Make sure you get the absolute latest version, 4.0 does NOT work with Jaguar.