BLUEFROG is well capable of posting his stance is this, but thanks 
And I explained that already.
For you, I repeat:
I want to add DTTP groups als External Folders to other Apps, so that they can use those as their own folders for their own content.
Esp. for DTTG this would be great, as it syncs to remote locations and therefor allows to sync ALL your DT and DTTG content for such Apps without using iCloud AND while staying encrypted!
That is a MASSIVE feature and has the potential to draw many more customers for DTTG too.
More clear now?
I found a workaround for this by using the External Folders that Working Copy offers: My current storage setup with DT and DTTG - #2 by tja