@dambron I am very sorry if it seemed like we were just trying to put you off with this! While being away I got a message from the guy who did all the new client development and he mentioned the “add only” mode just as Wayne did and so I thought I should ask you about it without actually looking into it myself. As I haven’t used the printer management myself I didn’t know that this mode was renamed years ago (Jul 10, 2015). Don’t wanna go back to that so I looked through the current client code again. To me it looks as if the “add only” mode is non existent in the client code anymore.
I’ve looked through the code for hours now but I still haven’t found out why it wouldn’t delete the printers anymore. Maybe it’s time to get a windows client installed and try this out myself…