in my CBS activity view I can see a lot of "config..." activities. What are those and why are they not seen by the Developer itself? Why can the delevoper not activate the "config"-activities in his NWDS?
each time a DC is created NWDS will create such an activity to create the root folder of the DC in DTR. Typically the name consists of "config_" + the user Id + some timestamp + a GUID.
You can also check these activities in the Closed Activities view and take a look at the files they contain. There should only be some folders (especially the _comp-Folder).
Due to the way empty folders are transported/propagated there is no need to explicitly activate them.