To not sure if this would work for you, and I may be way off base but how about this.
Your current system is, sort->scan->send. And you are trying t simplify the send step. This appears to be the simplest step. Now if if you really want to get crazy how about this.
scan->PDF->Bayesian filters->send
Here as the paper docs arrive they are immediately scanned as PDF.
Then using one of the PDF modules you pull the text out and send
it through a series of Bayesian filters to determine where they should
go. The PDF file is then attached into an email or loaded into
a db based on the characteristics in the file. (The text version is
only used for the Bayesian filter, and is discarded as soon as you deal
with the PDF.)
This reduces the workload of the sorters to just scanning the files.
Would be great. Unfortunatly the sort part of the process includes more than just sorting. Often there are human actions (phone calls, scheduling, etc) that need to take place, and most of the documents are hardly legible (hand writting, doodled on, faxed many times, etc) to humans, let alone computers :-(