When using the HTML5 viewer on a touch device (tested on iPhone and a Windows 7 touch screen), zoom gestures are performed by spreading two fingers apart. On consumer touch devices (iPad, etc), this zoom gesture is used in photos and mapping applications, and the zoom is centered at the midpoint between the two fingers, so that at the end of the zoom you're looking at a crop of the image that you had at the beginning of the zoom. The center of the zoom in the krpano viewer is unclear, and seems to change during the zoom gesture.
Here is a video of the desired behavior, using a different viewer from krpano:
https://www.dropbox.com/s/fk65fvcadtw7lt3/correct.mov
Here is the krpano behavior:
https://www.dropbox.com/s/orv147thiuaw5xx/translated.mov
It there any way to improve this? We are using the 1.18.5 HTML Viewer.