DropBox Business "Team Folders" Integration.
This is huge because you CAN'T control subfolder permissions with regular DropBox shared directories.
With DropBox business, you can specifically share every folder and subfolder to different people specifically.
It would work the same way as what you have already done with the regular DropBox Sync. There are App Integration options right in DropBox Business to do something like this.
Please help with this. Would possibly be willing to cover some development costs. Thanks.