@thomass: Thanks for testing it.
So it seems like the magazines viewer simply has hardcoded behavior which expects that it runs in portrait mode. It's certainly possible to fix this with a
patch. Anybody interested in fixing this is more than welcome to do so - I personally won't look into this, at least not in the foreseeable future. Come on people... you have all the required tools at hand, just get your hands dirty and actually do it!