There is no possibility to upload a directory as of such in WDA. You can at most make use of the [ACFUpDownload|http://help.sap.com/saphelp_nw70ehp1/helpdata/en/47/b9157c878a2d67e10000000a42189c/content.htm] UI element to provide the ability to upload multiple files at a time.
Security restrictions on the client side limit the amount of access to the filesystem. Therefore in plain HTML you can't get a file listing for a directory, nor can you even upload more than one file at a time.
With 7.01 we have AcfUpDownload. It is a Java Applet that allows greater access to the file system. While it can do multiple file uploads and downloads, it doesn't have any functionality to scan a directory and return a list of files. Nor is there any file open/save dialog. It was designed for DMS (Document Management System) Check-in and Check-out. Primarily in 7.01 it can mostly be used for check-out and and check-in from the checked-out location.
In 7.02, we will enhance AcfUpDownload to include a file open/save dialog. Then the user could manually select all files in a directory and upload them. However this function isn't available yet as 7.02 won't be available until next year.
In the mean time, you might consider using Adobe Flex as a Flash Islands within your Web Dynpro ABAP application. I've got an eLearning on how to use Flash Islands as a multiple file uploader:
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