That I know of, none of the Zen Cart shipping modules will work for anyone with drop shippers. I use shipping as an attribute since some of my drop shippers use 2nd day, some ground, some don't ship overseas, etc. The customer basically selects the type of shipping and/or their geographic location. And I change the settings for each product. For example:

1. 2nd day shipping to the continental US
2. Alaska, Puerto Rico, Canada ground
3. Australia express
4. Australia surface

And so on.

And yes, it's a pain in the ######.