This isn’t an issue with Laserfiche itself, and is more about how Windows handles its printer shortcuts.
That being said, I did a little bit of digging for you and found out that, on Windows 7 at least, you can get drag-and-drop printing working by following the solution posted near the bottom ofthis Microsoft community page. I just tested this using Windows 7 and Laserfiche 9.0.1, and it seems to work fine. If you’re trying to get this working on another version of Windows, I would suggest running some further Google searches.
As an alternate solution to quickly printing using Laserfiche Snapshot, as long as Snapshot is set as your default printer, you can simply right-click a document in Windows and select “Print”.