This is a great and very useful project.
I don't have the skills to add new features but if you're looking to add one, I'd really love a "Save to CMIS..." feature. CMIS is a standard for document management systems and there's already a Perl module for it: WebService::Cmis.
Requirements would be to:
Sample use case:
Feed stack of paper in scanner
select scan button (window appears with default scanner selected)
press scan (pages scan)
Select File>Save to CMIS...
Save to dialog appears
press icon/button "Select repository"
fill-in URL, user name, optionally password
connection takes place, root folder is displayed with sub-folders
select sub-folder after navigating to the correct one
enter document name
dialog to enter password appears
document is saved in PDF format in folder requested
Thanks for considering...