In the show, I recommended to join the support mailing list for digiKam. 

A couple of days ago I had a specific use case I could not find out how or even if I could do it, I could not find out by trial nor find anything in the manual. 

I submitted a straightforward question to the digiKam user e-mail list. After about two hours one of the developers responded that that what I wanted to do is not currently possible but a bug report for the use case already exist. 

Of course, not every question is answered so promptly. But again and again I am amazed of answers given both by the community and developers.