Merge Folders

I tried to merge the contents of two folders. I use (and bought for that reason) Hazel to organize my Dropbox folder. Some apps just save their files where they like it - and that is, what I don't like. So I created a small rule: If 1. Kind -> Folder and 2. Name "ScannerPro" then Move to "Dropbox/Apps". The problem started, when the rule had run the second time and the folder "ScannerPro" did already exist. Either the new folder will be renamed or the original folder will be deleted and replaced by the new folder. Both options are clearly not what I want. Apparently is not supported to merge the content of two folders. I tried a workaround, but this is - imo - not the way it should be. Hazel should support that naturally.
The workaround: On the Dropbox folder: If 1. Kind -> Folder and 2. Name "ScannerPro" then Move to "Dropbox/Apps/ScannerPro/". There is now a folder "ScannerPro" within "ScannerPro".
On the folder Dropbox/Apps/ScannerPro: First Rule: If Kind is Folder -> Run rule on folder contents; Second Rule: If kind is any file -> move to "Dropbox/Apps/ScannerPro"; Third Rule: If Kind is Folder and Size is 0 then move to trash.
Clearly, it could be way easier, if Hazel would support an option like "If folder exists: Merge folder contents".
The workaround: On the Dropbox folder: If 1. Kind -> Folder and 2. Name "ScannerPro" then Move to "Dropbox/Apps/ScannerPro/". There is now a folder "ScannerPro" within "ScannerPro".
On the folder Dropbox/Apps/ScannerPro: First Rule: If Kind is Folder -> Run rule on folder contents; Second Rule: If kind is any file -> move to "Dropbox/Apps/ScannerPro"; Third Rule: If Kind is Folder and Size is 0 then move to trash.
Clearly, it could be way easier, if Hazel would support an option like "If folder exists: Merge folder contents".