I’m quite new to this stuff as well but since nobody has responded I’ll just say that I think the debug screen is a feature added to the new version of Bitcoin/Litecoin and Peercoin has not updated to that version yet. I suppose it’s coming soon.
That debug screen is handy though it seems you can do the same stuff by simply running ppcoind in one instance then running commands from a second. Personally I think even Bitcoin could do it better. I don’t mind typing commands but for Bitcoin and, likewise, Peercoin to become mainstream people are going to need a less threatening way to do things like add wallet addresses, POS mine and other things.