Hi,
It seems KRPano will not make iPad tiles unless it has a 1:2 source image - that seems to be the crux of the matter.
In the description, it does say that the iPad can only support cubic panoramic images, so it would make sense that it can't work with 5000x750px, so it won't make iWhatever tiles in the first place!
right, the krpanoJS viewer supports only cubical panos,
but the krpano tools/droplets have the possibility to convert also partial 360x* panos to cubicals - then the 'rest' of the pano will be filled up with black color - and viewing limits will be defined to avoid looking at these black pixels,
but on iPhone and iPad the max. cubesize is technically limited to 1024x1024 pixels - so very 'small/narrow' partial panos will become unsharp/smooth - so the default limit for converting partial panos to cubicals is 360x120 - but this setting can be changed in the particular config file of the droplet,
best regards,
Klaus