I have tried everything to transfer files to/from my Bold 9780 using DS 6.0, but, unlike in previous versions, this feature seems to be unavailable. Only syncing is possible, but no selective, batch transfer of files (pictures/ringtones) is allowed.
Is there an alternative way ?
Thanks to those that will help.

I assume you're storing pictures on a media card. When you connect via USB to your pc the media card should mount like any external drive. You should be able to darn and drop files between the card and pc once the card is mounted. You should be prompted upon connection to choose the connection type. You want Mass Storage Mode.