Someone mentioned an app called Fileapp Pro for offline panoramas as an option in stead of Goodreader.
Its cheap so I have given it a try.
While it works very similar to Goodreader it has a problem that makes it unusable for showing tours.
While Goodreader has the problem that you can not open the menus again this one has the opposite.
Any click on thumbs, navigation buttons etc popup the menus at both top and bottom.
I have not been able to find any settings in it to lock the menus in fullscreen.
Hans