Any individual entity with more than one Kashflow account. will benefit from this. Currently Kashflow creates a dropbox folder Apps>kashflow. If you have 2 or more kashflow accounts all files will still be stored in the one folder and therefore visible to each kashflow account. The file name needs to be specific to the account eg Apps>kashflowcompany1>
I've noticed this too, I've had to create separate dropbox accounts to fix this.
As you say, it just needs KF to include the company name, or a unique KF account reference in the path.